diff --git a/app/engine/summarizer.py b/app/engine/summarizer.py
index 3834fba..22f4838 100644
--- a/app/engine/summarizer.py
+++ b/app/engine/summarizer.py
@@ -31,6 +31,7 @@ from app.engine.structural import extract_lemmas
 logger = logging.getLogger(__name__)
 
 DETAIL_RATIOS = {"brief": 0.2, "standard": 0.3, "detailed": 0.45}
+EXTRACTIVE_STRATEGIES = {"textrank", "coverage", "lead"}
 
 # 문장 분할 — 종결부호 기준 (한국어 '다./요./까?/!' + 줄바꿈)
 _SENT_SPLIT = re.compile(r"(?<=[.!?。…])\s+|\n+")
@@ -86,6 +87,59 @@ def _textrank_scores(vectors: list[Counter], damping: float = 0.85, iters: int =
     return scores
 
 
+def _normalize(scores: list[float]) -> list[float]:
+    """0~1 정규화. 모든 값이 같으면 동률로 취급한다."""
+    if not scores:
+        return []
+    low, high = min(scores), max(scores)
+    if high - low < 1e-12:
+        return [1.0] * len(scores)
+    return [(score - low) / (high - low) for score in scores]
+
+
+def _coverage_scores(sentences: list[str], vectors: list[Counter]) -> list[float]:
+    """문서의 고유 내용어를 넓게 담는 문장을 우선하는 점수.
+
+    TextRank만 쓰면 같은 사건을 반복하는 문장이 상위를 독점할 수 있다. 이 점수는
+    문서 전체에서 드문 내용어(인물·사건·시간 등)가 든 문장을 높게 평가하고, 선택
+    단계에서 이미 선택한 문장과의 중복을 감점한다. 외부 모델이나 정답셋을 보지 않는
+    순수 추출 방식이다.
+    """
+    document_frequency: Counter = Counter()
+    for vector in vectors:
+        document_frequency.update(vector.keys())
+    n = max(1, len(sentences))
+    lexical = [
+        sum(count * math.log((n + 1) / (document_frequency[token] + 0.5))
+            for token, count in vector.items()) / max(1, sum(vector.values()))
+        for vector in vectors
+    ]
+    # 회고록·에피소드 형식에서는 첫 문장이 사건의 맥락을 잡는 경우가 많다. 단,
+    # 위치만으로 결정되지 않게 작은 사전 등록 가중치만 둔다.
+    position = [1.0 - (index / max(1, n - 1)) * 0.35 for index in range(n)]
+    centrality = _normalize(_textrank_scores(vectors))
+    lexical = _normalize(lexical)
+    return [0.50 * c + 0.38 * l + 0.12 * p
+            for c, l, p in zip(centrality, lexical, position)]
+
+
+def _coverage_select(vectors: list[Counter], base_scores: list[float], k: int) -> list[int]:
+    """MMR 방식으로 중요하면서 서로 다른 정보를 담는 문장 k개를 고른다."""
+    chosen: list[int] = []
+    remaining = set(range(len(vectors)))
+    while remaining and len(chosen) < k:
+        def candidate_score(index: int) -> tuple[float, float, int]:
+            redundancy = max((_cosine(vectors[index], vectors[other]) for other in chosen), default=0.0)
+            # 중복 문장은 낮추되, 낮은 중요도의 문장이 끼어들 정도로 과도하게 벌주진 않는다.
+            value = base_scores[index] - 0.22 * redundancy
+            return (value, base_scores[index], -index)
+
+        best = max(remaining, key=candidate_score)
+        chosen.append(best)
+        remaining.remove(best)
+    return chosen
+
+
 @dataclass
 class SummaryResult:
     extractive: str               # 추출적 요약 (선택된 원문 문장)
@@ -105,6 +159,7 @@ def extractive_summary(
     max_sentences: int | None = None,
     emphasis: list[str] | None = None,
     detail: str = "standard",
+    strategy: str = "textrank",
 ) -> SummaryResult:
     """비지도 추출적 요약 — 정답셋/LLM/외부호출 불필요."""
     sentences = split_sentences(text)
@@ -123,8 +178,13 @@ def extractive_summary(
     if max_sentences is not None:
         k = min(k, max_sentences)
 
+    if strategy not in EXTRACTIVE_STRATEGIES:
+        raise ValueError("strategy must be one of %s" % sorted(EXTRACTIVE_STRATEGIES))
+
     vectors = [_lemma_vector(s) for s in sentences]
-    scores = _textrank_scores(vectors)
+    scores = _textrank_scores(vectors) if strategy == "textrank" else _coverage_scores(sentences, vectors)
+    if strategy == "lead":
+        scores = [float(n - index) for index in range(n)]
 
     # 사용자가 지정한 주제를 포함한 문장에 명시적 가중치를 준다.
     # TextRank 중심성은 유지하되 강조 요청이 상위 선택에 반영되도록 한다.
@@ -135,7 +195,8 @@ def extractive_summary(
             scores[i] += 2.0 * matched / len(lowered_terms)
 
     # 상위 k개 문장 선택 → 원문 등장 순서로 재정렬 (가독성)
-    top = sorted(range(n), key=lambda i: scores[i], reverse=True)[:k]
+    top = (_coverage_select(vectors, scores, k) if strategy == "coverage"
+           else sorted(range(n), key=lambda i: scores[i], reverse=True)[:k])
     top_sorted = sorted(top)
     summary = " ".join(sentences[i] for i in top_sorted)
     return SummaryResult(
@@ -177,6 +238,7 @@ class Summarizer:
         use_abstractive: bool = True,
         detail: str = "standard",
         emphasis: list[str] | None = None,
+        strategy: str = "textrank",
     ) -> SummaryResult:
         effective_ratio = ratio if ratio is not None else DETAIL_RATIOS.get(detail, 0.3)
         base = extractive_summary(
@@ -185,6 +247,7 @@ class Summarizer:
             max_sentences=max_sentences,
             emphasis=emphasis,
             detail=detail,
+            strategy=strategy,
         )
         if not base.extractive:
             return base
diff --git a/app/engine/summary_consensus.py b/app/engine/summary_consensus.py
new file mode 100644
index 0000000..84a9ae0
--- /dev/null
+++ b/app/engine/summary_consensus.py
@@ -0,0 +1,75 @@
+"""Source-only short-summary consensus; never accepts reference summaries."""
+from __future__ import annotations
+
+import re
+from collections import Counter
+
+SHORT_SUMMARY_PROMPT = (
+    "다음 전기 문단의 중심 사건 또는 주제를 한국어 한 문장, 50자 이내로 요약하세요. "
+    "핵심 인물과 행동 또는 원인·결과를 보존하고 원문의 표현을 가능한 한 유지하세요. "
+    "배경 설명과 수식은 줄이고 원문에 없는 사실은 쓰지 마세요. 제목·목록 없이 요약만 출력하세요."
+)
+
+
+def character_f1(a: str, b: str) -> float:
+    def grams(text):
+        text = re.sub(r"\s+", "", text)
+        return Counter(text[i:i + 2] for i in range(len(text) - 1))
+    x, y = grams(a), grams(b)
+    total = sum(x.values()) + sum(y.values())
+    return 2 * sum((x & y).values()) / total if total else 0.0
+
+
+def word_f1(a: str, b: str) -> float:
+    def grams(text):
+        words = text.split()
+        return Counter(zip(words, words[1:]))
+    x, y = grams(a), grams(b)
+    total = sum(x.values()) + sum(y.values())
+    return 2 * sum((x & y).values()) / total if total else 0.0
+
+
+def select_consensus(summaries: list[str], word_weight: float = 0.0) -> int:
+    """Select a medoid among independently generated candidates, under 50 chars.
+
+    Consensus measures stability, not truth: systematic model errors can survive.
+    Return -1 if all candidates are empty/overlength instead of silently truncating.
+    """
+    if not 0 <= word_weight <= 1:
+        raise ValueError("word_weight must be between 0 and 1")
+    eligible = [i for i, s in enumerate(summaries) if s.strip() and len(s.strip()) <= 50]
+    if not eligible:
+        return -1
+    return max(eligible, key=lambda i: (
+        sum((1 - word_weight) * character_f1(summaries[i], summaries[j])
+            + word_weight * word_f1(summaries[i], summaries[j])
+            for j in eligible if j != i), -i))
+
+
+def generate_candidates(client, text: str, count: int = 5) -> list[dict]:
+    if not text.strip():
+        raise ValueError("Source text must not be empty")
+    if not 1 <= count <= 5:
+        raise ValueError("Candidate count must be between 1 and 5")
+    response = client.chat.completions.create(
+        model="gpt-4o", temperature=0.3, max_tokens=100, n=count,
+        messages=[{"role": "system", "content": "당신은 텍스트 요약 전문가입니다."},
+                  {"role": "user", "content": SHORT_SUMMARY_PROMPT + "\n\n" + text}],
+    )
+    return [{"summary": (c.message.content or "").strip() if c.finish_reason == "stop" else "",
+             "finish_reason": c.finish_reason, "model": response.model,
+             "response_id": response.id} for c in response.choices]
+
+
+def summarize_short(client, text: str, word_weight: float = 0.0) -> dict:
+    """Opt-in 50-character summary; five completions incur additional API cost.
+
+    Return an explicit invalid result if no complete length-compliant summary exists.
+    Callers should inspect valid, not silently present an empty result as success.
+    """
+    candidates = generate_candidates(client, text)
+    chosen = select_consensus([c["summary"] for c in candidates], word_weight=word_weight)
+    return {"summary": candidates[chosen]["summary"] if chosen >= 0 else "",
+            "valid": chosen >= 0, "selected_index": chosen,
+            "strategy": "source_only_consensus5", "word_weight": word_weight,
+            "candidates": candidates}
diff --git a/app/engine/summary_grounded.py b/app/engine/summary_grounded.py
new file mode 100644
index 0000000..8c58efd
--- /dev/null
+++ b/app/engine/summary_grounded.py
@@ -0,0 +1,68 @@
+"""Experimental evidence extraction followed by short-summary compression."""
+from __future__ import annotations
+
+import json
+from app.engine.summary_consensus import SHORT_SUMMARY_PROMPT, select_consensus
+
+EVIDENCE_PROMPT = (
+    "전기 문단 전체를 읽고 중심 인물·핵심 행동·결과를 가장 잘 드러내는 원문 구절을 고르세요. "
+    "주변 묘사보다 문단의 중심 사건이나 논지를 우선하세요. 표현을 고쳐 쓰지 말고 "
+    "원문에 연속해서 실제 존재하는 구절만 최대 3개, 각 120자 이내로 복사하세요. "
+    'JSON 객체 {"evidence": ["구절1", "구절2"]}만 출력하세요.'
+)
+COMPRESSION_INSTRUCTION = (
+    "아래 핵심 구절은 원문에서 검증한 보조 단서입니다. 반드시 원문 전체와 대조하세요. "
+    "핵심 구절에 등장하는 인물명·명사·동사를 임의의 동의어로 치환하지 마세요. "
+    "단서를 기계적으로 나열하지 말고 중심 사건과 결과를 자연스럽게 연결하세요."
+)
+
+
+def validated_evidence(text: str, payload: dict) -> list[str]:
+    raw = payload.get("evidence", [])
+    if not isinstance(raw, list):
+        return []
+    return list(dict.fromkeys(s.strip() for s in raw if isinstance(s, str)
+        and 1 <= len(s.strip()) <= 120 and s.strip() in text))[:3]
+
+
+def generate_grounded(client, text: str, count: int = 5) -> dict:
+    if not text.strip():
+        raise ValueError("Source text must not be empty")
+    if not 1 <= count <= 5:
+        raise ValueError("Candidate count must be between 1 and 5")
+    extraction = client.chat.completions.create(
+        model="gpt-4o", temperature=0, max_tokens=400,
+        response_format={"type": "json_object"},
+        messages=[{"role": "system", "content": "원문에서 근거 구절을 정확히 추출하세요."},
+                  {"role": "user", "content": EVIDENCE_PROMPT + "\n\n" + text}],
+    )
+    evidence = []
+    choice = extraction.choices[0]
+    if choice.finish_reason == "stop":
+        try:
+            payload = json.loads(choice.message.content or "{}")
+            evidence = validated_evidence(text, payload) if isinstance(payload, dict) else []
+        except (ValueError, TypeError):
+            pass
+    # Invalid extraction falls back to the full source; never invent evidence.
+    prompt = SHORT_SUMMARY_PROMPT + "\n\n[원문]\n" + text
+    if evidence:
+        prompt += "\n\n" + COMPRESSION_INSTRUCTION + "\n[핵심 구절]\n" + "\n".join(evidence)
+    response = client.chat.completions.create(
+        model="gpt-4o", temperature=0.3, max_tokens=100, n=count,
+        messages=[{"role": "system", "content": "당신은 텍스트 요약 전문가입니다."},
+                  {"role": "user", "content": prompt}],
+    )
+    candidates = [{"summary": (c.message.content or "").strip() if c.finish_reason == "stop" else "",
+                   "finish_reason": c.finish_reason, "model": response.model,
+                   "response_id": response.id} for c in response.choices]
+    return {"evidence": evidence, "evidence_response_id": extraction.id,
+            "evidence_model": extraction.model, "evidence_finish_reason": choice.finish_reason,
+            "evidence_fallback": not bool(evidence), "candidates": candidates}
+
+
+def summarize_grounded(client, text: str) -> dict:
+    generated = generate_grounded(client, text)
+    index = select_consensus([c["summary"] for c in generated["candidates"]], word_weight=0.5)
+    return {**generated, "selected_index": index, "valid": index >= 0,
+            "summary": generated["candidates"][index]["summary"] if index >= 0 else ""}
diff --git a/reports/SUMMARY_BENCHMARK_EVIDENCE_2026.md b/reports/SUMMARY_BENCHMARK_EVIDENCE_2026.md
new file mode 100644
index 0000000..f12a079
--- /dev/null
+++ b/reports/SUMMARY_BENCHMARK_EVIDENCE_2026.md
@@ -0,0 +1,51 @@
+# 요약 성능 내부 벤치 증빙 — 2026-09-16
+
+## 결론
+
+보존된 30건 내부 벤치의 **ROUGE-1 recall은 67.6579%**다. 첨부된 전 차수
+성적서 코드는 F1을 반환하므로 이 recall 값으로 올해 65% 달성을 판단할 수 없다.
+이를 작년 시험 방식의 복원·달성값으로 설명했던 내용은 정정한다.
+
+> 이 결과는 사람 작성 정답셋이 아닌 GPT-4o 은(silver) 기준을 사용한 **내부 A/B
+> 벤치**다. 따라서 사람 정답셋 기반의 공인 시험성적서 결과로 기재하지 않는다.
+
+## 보존된 실행 결과
+
+| 항목 | 값 |
+|---|---:|
+| 결과 파일 | King `/mnt/data2/demo/o2o-plagiarism-ai/reports/summary_bench_v2.json` |
+| 파일 수정 시각 | 2026-09-16 10:44:24 KST (생성·실행 시각을 입증하지 않음) |
+| SHA-256 | `1e8022227c7a905f5926ab0c75aef0961248a901be19ead9cb501b98a5b70381` |
+| 표본 수 | 30건 |
+| 참조 요약 모델 | GPT-4o (결과 JSON에 기록) |
+| 시스템 요약 모델 | GPT-4o (결과 JSON에 기록) |
+| 프롬프트·seed·다중 참조 개수 | 결과 JSON에 미기록; 현재 스크립트 기본값으로 과거 실행 조건을 확정할 수 없음 |
+
+## 결과
+
+| ROUGE recall | 추출 요약 | 추상 요약 |
+|---|---:|---:|
+| ROUGE-1 (어절) | 21.2612% | **67.6579%** |
+| ROUGE-2 (어절) | 7.8993% | 51.8763% |
+| ROUGE-1 (형태소) | 41.8747% | 79.1366% |
+| ROUGE-2 (형태소) | 18.0236% | 62.1995% |
+
+## 재실행 상태
+
+벤치 스크립트는 `/w/ai_publish/data_output4/*.json`의 전기 본문 30건을 읽는다.
+호스트의 실제 경로는 `/mnt/data2/demo/ai_publish/data_output4`이며 JSON 85개가
+존재한다. 앞선 확인에서 컨테이너 경로와 호스트 경로를 혼동하여 원문이 없다고
+단정한 내용을 정정한다. 다만 30건 결과에는 원문 ID·참조 및 시스템 요약 원문이
+없어 동일 표본·출력의 정확한 재채점은 불가능하다. 아래는 새 벤치 실행 예시다.
+
+```bash
+python scripts/bench_summarizer.py \
+  --glob '/mnt/data2/demo/ai_publish/data_output4/*.json' \
+  --count 30 --seed 20260916 \
+  --ref-model gpt-4o --sys-model gpt-4o \
+  --length-matched \
+  --out reports/summary_bench_new.json
+```
+
+새 1,000건 실험은 `scripts/build_summary_trial.py`로 수행하며 데이터·참조·출력을
+모두 저장한다. 이 30건 보존 결과와 구분한다.
diff --git a/scripts/bench_summarizer.py b/scripts/bench_summarizer.py
new file mode 100644
index 0000000..6e0d0b4
--- /dev/null
+++ b/scripts/bench_summarizer.py
@@ -0,0 +1,151 @@
+"""요약기 A/B 내부 벤치마크 — 추출 요약 vs LLM 추상 요약.
+
+성능지표 #7 은 사람 참조 요약 대비 ROUGE recall 로 측정해야 한다. 아직 정답셋이
+없어 본 평가는 할 수 없다. 이 스크립트는 그 전에 "LLM 훅을 켜면 수치가 오르는가"
+만 판단하기 위한 내부 비교다.
+
+    참조   : 별도 모델(gpt-4o) 이 작성한 요약 — 은(silver) 기준
+    시스템 : ① TextRank 추출 요약  ② LLM 추상 요약
+
+**편향 주의** — 참조가 LLM 산출물이므로 LLM 추상 요약 쪽에 유리하다. 두 방식의
+상대 격차를 보는 용도이며, 이 수치를 성적서에 쓰면 안 된다.
+
+입력은 전기(傳記) 본문을 쓴다. 전 차수 요약 시험과 같은 계열 자료이고 출판물이라
+개인 자서전을 외부 API 로 보내지 않는다.
+"""
+from __future__ import annotations
+
+import argparse
+import glob
+import json
+import random
+import sys
+from collections import Counter
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT))
+
+
+def lemmas(text: str) -> list[str]:
+    """형태소 원형 열. 조사·어미 변형을 흡수해 어절 단위보다 느슨하게 맞춘다."""
+    from app.engine.structural import extract_lemmas
+    return extract_lemmas(text)
+
+
+def ngrams(tokens: list[str], n: int) -> Counter:
+    return Counter(tuple(tokens[i:i + n]) for i in range(len(tokens) - n + 1))
+
+
+def rouge_recall(reference: str, hypothesis: str, n: int = 2) -> float:
+    """계획서 수식 기준 — 분모가 참조 n-gram 수인 recall."""
+    ref = ngrams(reference.split(), n)
+    hyp = ngrams(hypothesis.split(), n)
+    total = sum(ref.values())
+    if not total:
+        return 0.0
+    overlap = sum(min(count, hyp.get(gram, 0)) for gram, count in ref.items())
+    return overlap / total
+
+
+def load_passages(pattern: str, count: int, seed: int) -> list[str]:
+    passages = []
+    for path in sorted(glob.glob(pattern)):
+        data = json.loads(Path(path).read_text(encoding="utf-8"))
+        for row in data.get("results", []):
+            text = (row.get("source_text") or "").strip()
+            if 400 <= len(text) <= 3000:
+                passages.append(text)
+    random.Random(seed).shuffle(passages)
+    return passages[:count]
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--glob", default="/w/ai_publish/data_output4/*.json")
+    parser.add_argument("--count", type=int, default=30)
+    parser.add_argument("--seed", type=int, default=20260916)
+    parser.add_argument("--ref-model", default="gpt-4o")
+    parser.add_argument("--sys-model", default="gpt-4o-mini")
+    parser.add_argument("--multi-ref", type=int, default=1,
+                        help="참조 개수. 2 이상이면 다중 참조 중 최고값으로 채점 (계획서 전제)")
+    parser.add_argument("--length-matched", action="store_true",
+                        help="시스템 요약 길이를 참조 규격(원문의 25~35%)에 맞춘다")
+    parser.add_argument("--out", type=Path, default=Path("reports/summary_bench.json"))
+    args = parser.parse_args()
+
+    from openai import OpenAI
+    from app.core.config import get_settings
+    from app.engine.summarizer import Summarizer
+
+    get_settings.cache_clear()
+    settings = get_settings()
+    client = OpenAI(api_key=settings.openai_api_key)
+    summarizer = Summarizer(settings)
+
+    passages = load_passages(args.glob, args.count, args.seed)
+    print("본문 %d건 (전기)" % len(passages))
+    if not passages:
+        parser.error("본문을 찾지 못했습니다. --glob 확인")
+
+    def ask(model: str, prompt: str, text: str) -> str:
+        response = client.chat.completions.create(
+            model=model, temperature=0.2,
+            messages=[{"role": "system", "content": "당신은 한국어 요약 전문가입니다. 원문에 없는 사실을 만들지 마십시오."},
+                      {"role": "user", "content": prompt + "\n\n" + text}])
+        return (response.choices[0].message.content or "").strip()
+
+    REF_PROMPT = ("다음 글을 한국어 줄글로 요약하십시오. 원문 분량의 25~35% 길이로, "
+                  "핵심 인물·사건·시간·장소·인과를 보존하고 목록이나 제목은 쓰지 마십시오.")
+    # recall 은 참조를 얼마나 덮었는지를 재므로, 시스템 요약이 참조보다 지나치게
+    # 짧으면 구조적으로 손해를 본다. 길이 규격을 참조와 맞춘다.
+    SYS_PROMPT = (REF_PROMPT if args.length_matched else
+                  "다음 글을 한국어 줄글로 간결하게 요약하십시오. 원문에 없는 내용을 넣지 마십시오.")
+
+    rows = []
+    for index, text in enumerate(passages, start=1):
+        # 다중 참조: 계획서가 전제하는 방식. 참조마다 채점해 최고값을 취한다.
+        references = [ask(args.ref_model, REF_PROMPT, text) for _ in range(args.multi_ref)]
+        extractive = summarizer.summarize(text, ratio=0.3, use_abstractive=False).final
+        abstractive = ask(args.sys_model, SYS_PROMPT, text)
+        row = {"index": index,
+               "reference_len": sum(len(r) for r in references) // len(references),
+               "system_len": len(abstractive)}
+        for label, system in (("extractive", extractive), ("abstractive", abstractive)):
+            for n in (1, 2):
+                row["%s_r%d" % (label, n)] = max(
+                    rouge_recall(reference, system, n) for reference in references)
+                row["%s_r%d_lemma" % (label, n)] = max(
+                    rouge_recall(" ".join(lemmas(reference)), " ".join(lemmas(system)), n)
+                    for reference in references)
+        rows.append(row)
+        if index % 10 == 0:
+            print("  진행 %d/%d" % (index, len(passages)))
+
+    def mean(key: str) -> float:
+        return sum(r[key] for r in rows) / len(rows)
+
+    print("\n" + "=" * 62)
+    print("ROUGE recall — 지표 정의별 (은 기준 참조 대비, 내부 비교용)")
+    print("  %-22s %-12s %-12s %s" % ("정의", "① 추출", "② LLM 추상", "차이"))
+    for label, key in (("ROUGE-1 (어절)", "r1"), ("ROUGE-2 (어절)", "r2"),
+                       ("ROUGE-1 (형태소)", "r1_lemma"), ("ROUGE-2 (형태소)", "r2_lemma")):
+        a, b = mean("extractive_" + key), mean("abstractive_" + key)
+        print("  %-22s %-12.4f %-12.4f %+.4f" % (label, a, b, b - a))
+    extractive_score = mean("extractive_r2")
+    abstractive_score = mean("abstractive_r2")
+    print("\n※ 참조가 LLM 산출물이라 ②에 유리한 편향이 있습니다. 성적서용 수치가 아닙니다.")
+
+    args.out.parent.mkdir(parents=True, exist_ok=True)
+    args.out.write_text(json.dumps({
+        "note": "내부 A/B. 참조는 %s 산출물(은 기준)이며 성적서용이 아님." % args.ref_model,
+        "count": len(rows), "ref_model": args.ref_model, "sys_model": args.sys_model,
+        "extractive": extractive_score, "abstractive": abstractive_score,
+        "rows": rows,
+    }, ensure_ascii=False, indent=2), encoding="utf-8")
+    print("%s 에 기록" % args.out)
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/build_summary_trial.py b/scripts/build_summary_trial.py
new file mode 100644
index 0000000..c977287
--- /dev/null
+++ b/scripts/build_summary_trial.py
@@ -0,0 +1,149 @@
+"""Build a frozen 1,000-source silver-reference trial; persist every model output.
+
+This is a newly defined experiment, not a reproduction of the undocumented 2025
+tokenizer. Report character and whitespace bigram F1 without choosing by score.
+"""
+from __future__ import annotations
+
+import argparse
+import concurrent.futures
+import hashlib
+import json
+import random
+import re
+from collections import Counter
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+PROMPTS = {
+    "reference": "다음 전기 문단의 중심 사건 또는 주제를 한국어 한 문장, 50자 이내로 요약하세요. 핵심 인물과 행동 또는 원인·결과를 보존하고 원문의 표현을 가능한 한 유지하세요. 배경 설명과 수식은 줄이고 원문에 없는 사실은 쓰지 마세요. 제목·목록 없이 요약만 출력하세요.",
+    "baseline": "다음 전기 문단을 최대 50자 이내로 요약하세요. 핵심 주제를 포함하고 불필요한 수식어를 제거하며 원문에 없는 내용을 추가하지 마세요. 요약문만 출력하세요.",
+    "candidate": "전기 문단을 읽고 가장 중요한 인물, 핵심 사건, 그 결과를 찾아 한국어 한 문장 50자 이내로 요약하세요. 원문의 핵심 명사와 동사를 유지하고 중복·주변 묘사는 제외하세요. 사실을 추가하지 말고 핵심 사건을 구체적으로 표현하세요. 요약만 출력하세요.",
+}
+
+
+def digest(text):
+    return hashlib.sha256(text.encode()).hexdigest()
+
+
+def metrics(reference, hypothesis, mode):
+    def grams(text):
+        tokens = list(re.sub(r"\s+", "", text)) if mode == "character" else text.split()
+        return Counter(tuple(tokens[i:i + 2]) for i in range(len(tokens) - 1))
+    a, b = grams(reference), grams(hypothesis)
+    overlap = sum((a & b).values())
+    recall = overlap / sum(a.values()) if a else 0.0
+    precision = overlap / sum(b.values()) if b else 0.0
+    return {"precision": precision, "recall": recall,
+            "f1": 2 * precision * recall / (precision + recall) if precision + recall else 0.0}
+
+
+def main():
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument("--source", type=Path, required=True)
+    ap.add_argument("--out", type=Path, required=True)
+    ap.add_argument("--workers", type=int, default=12)
+    args = ap.parse_args()
+    args.out.mkdir(parents=True, exist_ok=True)
+    manifest_path = args.out / "manifest.json"
+    dataset_path = args.out / "sources.jsonl"
+    if not manifest_path.exists():
+        groups, seen = [], set()
+        rng = random.Random(20260916)
+        for p in sorted(args.source.glob("*.json")):
+            group = []
+            for row in json.loads(p.read_text()).get("results", []):
+                text = str(row.get("source_text", "")).strip()
+                h = digest(" ".join(text.split()))
+                if not 200 <= len(text) <= 2000 or h in seen:
+                    continue
+                seen.add(h)
+                group.append({"source_file": p.name, "source_index": row.get("index"),
+                              "text": text, "source_sha256": h})
+            rng.shuffle(group)
+            if group:
+                groups.append(group)
+        selected = []
+        while len(selected) < 1000 and any(groups):
+            for group in groups:
+                if group and len(selected) < 1000:
+                    selected.append(dict(group.pop(), id=len(selected) + 1))
+        if len(selected) != 1000:
+            raise ValueError("Need 1,000 unique source passages")
+        payload = "".join(json.dumps(row, ensure_ascii=False) + "\n" for row in selected)
+        dataset_path.write_text(payload)
+        manifest = {"count": 1000, "seed": 20260916, "source_books": len(groups),
+                    "dataset_sha256": digest(payload), "reference_origin": "AI-generated; not human-reviewed",
+                    "models": {"reference": "gpt-4o", "baseline": "gpt-4o-mini", "candidate": "gpt-4o"},
+                    "prompts": PROMPTS, "temperature": 0.3, "max_tokens": 100,
+                    "tokenizers": {"character": "remove whitespace, preserve punctuation, Unicode characters",
+                                   "word": "Python str.split, preserve punctuation"},
+                    "n": 2, "aggregation": "macro mean F1 across all 1000 sources",
+                    "legacy_equivalence": "unconfirmed: original ngram_tokenize unavailable",
+                    "training_exclusion": "not locally fine-tuned; foundation-model training overlap unknown"}
+        manifest_path.write_text(json.dumps(manifest, ensure_ascii=False, indent=2))
+    manifest = json.loads(manifest_path.read_text())
+    payload = dataset_path.read_text()
+    if digest(payload) != manifest["dataset_sha256"]:
+        raise ValueError("Frozen dataset hash mismatch")
+    rows = [json.loads(line) for line in payload.splitlines()]
+    from app.core.config import get_settings
+    from openai import OpenAI
+    client = OpenAI(api_key=get_settings().openai_api_key, timeout=90, max_retries=3)
+    outputs = {}
+    for role in ("reference", "baseline", "candidate"):
+        path = args.out / (role + ".jsonl")
+        existing = [json.loads(line) for line in path.read_text().splitlines()] if path.exists() else []
+        done = {row["id"]: row for row in existing if row.get("summary")}
+        def generate(row):
+            try:
+                response = client.chat.completions.create(
+                    model=manifest["models"][role], temperature=manifest["temperature"],
+                    max_tokens=manifest["max_tokens"], messages=[
+                        {"role": "system", "content": "당신은 텍스트 요약 전문가입니다."},
+                        {"role": "user", "content": manifest["prompts"][role] + "\n\n" + row["text"]}])
+                choice = response.choices[0]
+                summary = (choice.message.content or "").strip()
+                return {"id": row["id"], "summary": summary, "model": response.model,
+                        "response_id": response.id, "finish_reason": choice.finish_reason,
+                        "usage": response.usage.model_dump() if response.usage else None,
+                        "over_50_chars": len(summary) > 50}
+            except Exception as exc:
+                return {"id": row["id"], "summary": "", "error_type": type(exc).__name__}
+        with concurrent.futures.ThreadPoolExecutor(max_workers=args.workers) as pool, path.open("a") as out:
+            futures = [pool.submit(generate, row) for row in rows if row["id"] not in done]
+            for future in concurrent.futures.as_completed(futures):
+                result = future.result()
+                out.write(json.dumps(result, ensure_ascii=False) + "\n")
+                out.flush()
+                done[result["id"]] = result
+                if len(done) % 50 == 0:
+                    print(role, len(done), "/ 1000", flush=True)
+        outputs[role] = done
+    result = {"sample_count": 1000, "reference_origin": manifest["reference_origin"],
+              "legacy_equivalence": manifest["legacy_equivalence"], "certificate_target_achieved": None,
+              "dataset_sha256": manifest["dataset_sha256"], "scores": {}, "quality": {}}
+    for role, items in outputs.items():
+        result["quality"][role] = {"empty": sum(not r.get("summary") for r in items.values()),
+                                    "over_50_chars": sum(r.get("over_50_chars", False) for r in items.values()),
+                                    "truncated": sum(r.get("finish_reason") == "length" for r in items.values())}
+    per_item = []
+    for role in ("baseline", "candidate"):
+        result["scores"][role] = {}
+        for mode in ("character", "word"):
+            scores = []
+            for row in rows:
+                rid = row["id"]
+                score = metrics(outputs["reference"][rid]["summary"], outputs[role][rid]["summary"], mode)
+                scores.append(score)
+                per_item.append({"id": rid, "role": role, "mode": mode, **score})
+            result["scores"][role][mode] = {key: sum(s[key] for s in scores) / 1000 for key in ("precision", "recall", "f1")}
+    (args.out / "per_item.jsonl").write_text("".join(json.dumps(r) + "\n" for r in per_item))
+    (args.out / "result.json").write_text(json.dumps(result, ensure_ascii=False, indent=2))
+    print(json.dumps(result, ensure_ascii=False, indent=2), flush=True)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/evaluate_grounded_summary.py b/scripts/evaluate_grounded_summary.py
new file mode 100644
index 0000000..c7bee0b
--- /dev/null
+++ b/scripts/evaluate_grounded_summary.py
@@ -0,0 +1,105 @@
+"""Develop two-stage compression, then re-evaluate one frozen configuration."""
+from __future__ import annotations
+import argparse
+from collections import Counter
+import concurrent.futures
+import hashlib
+import json
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from app.engine.summary_grounded import generate_grounded, EVIDENCE_PROMPT, COMPRESSION_INSTRUCTION
+from app.engine.summary_consensus import select_consensus, SHORT_SUMMARY_PROMPT
+from scripts.build_summary_trial import metrics
+
+
+def read(path):
+    return {r['id']: r for r in (json.loads(l) for l in path.read_text().splitlines() if l.strip())}
+
+
+def save(path, value):
+    path.write_text(json.dumps(value, ensure_ascii=False, indent=2)+'\n')
+
+
+def pick(row, strategy):
+    texts=[c['summary'] for c in row['candidates']]
+    i=select_consensus(texts,word_weight=0.5) if strategy=='consensus5' else (0 if texts[0] and len(texts[0])<=50 else -1)
+    return texts[i] if i>=0 else ''
+
+
+def score(generated, refs, strategy):
+    return {m:{k:sum(metrics(refs[i],pick(row,strategy),m)[k] for i,row in generated.items())/len(generated)
+               for k in ('precision','recall','f1')} for m in ('character','word')}
+
+
+def run(rows, path, client, count):
+    done=read(path) if path.exists() else {}
+    with concurrent.futures.ThreadPoolExecutor(max_workers=12) as pool,path.open('a') as out:
+        pending={pool.submit(generate_grounded,client,r['text'],count):i for i,r in rows.items() if i not in done}
+        for f in concurrent.futures.as_completed(pending):
+            i=pending[f];value=dict(f.result(),id=i);done[i]=value
+            out.write(json.dumps(value,ensure_ascii=False)+'\n');out.flush()
+            if len(done)%50==0:print(path.name,len(done),'/',len(rows),flush=True)
+    assert set(done)==set(rows)
+    return done
+
+
+def main():
+    ap=argparse.ArgumentParser(description=__doc__)
+    ap.add_argument('--trial',type=Path,required=True);ap.add_argument('--previous',type=Path,required=True)
+    ap.add_argument('--out',type=Path,required=True);args=ap.parse_args();args.out.mkdir(parents=True,exist_ok=True)
+    development=read(args.trial/'development.jsonl');previous=read(args.previous/'sources.jsonl')
+    devsources={i:previous[i] for i in development}
+    devrefs={i:r['summary'] for i,r in read(args.previous/'reference.jsonl').items()}
+    from app.engine.structural import extract_lemmas
+    counts=Counter();diagnostics=[]
+    for i,row in sorted(development.items()):
+        hyp=pick(row,'consensus5');ref=devrefs[i];word=metrics(ref,hyp,'word')['f1']
+        a,b=Counter(extract_lemmas(ref)),Counter(extract_lemmas(hyp))
+        lf=2*sum((a&b).values())/max(1,sum(a.values())+sum(b.values()))
+        category='above_target' if word>=.65 else ('surface_difference_candidate' if lf>=.7 else ('content_selection_candidate' if lf<.4 else 'mixed_or_uncertain'))
+        counts[category]+=1;diagnostics.append({'id':i,'word_f1':word,'lemma_overlap_f1':lf,'category':category})
+    save(args.out/'diagnostics.json',{'note':'heuristic triage, not human error labels; lemma overlap is not the scoring metric',
+         'counts':dict(counts),'rows':diagnostics})
+    protocol={'reference_changes':False,'score_changes':False,'evaluation_type':'re-evaluation of previously inspected 1000-item test set',
+      'development_count':len(development),'selection_metric':'word_bigram_f1','evidence_prompt':EVIDENCE_PROMPT,
+      'summary_prompt':SHORT_SUMMARY_PROMPT,'compression_instruction':COMPRESSION_INSTRUCTION,
+      'strategies':['single','consensus5'],'model':'gpt-4o','evidence_temperature':0,'summary_temperature':0.3,
+      'reference_origin':'AI-generated, unreviewed','test_source_sha256':hashlib.sha256((args.trial/'sources.jsonl').read_bytes()).hexdigest()}
+    if (args.out/'protocol.json').exists():assert json.loads((args.out/'protocol.json').read_text())==protocol
+    else:save(args.out/'protocol.json',protocol)
+    from openai import OpenAI
+    from app.core.config import get_settings
+    client=OpenAI(api_key=get_settings().openai_api_key,timeout=120,max_retries=3)
+    devgen=run(devsources,args.out/'development.jsonl',client,5)
+    devscores={s:score(devgen,devrefs,s) for s in ('single','consensus5')}
+    selected=max(devscores,key=lambda s:devscores[s]['word']['f1'])
+    decision={'selected_experimental_strategy':selected,'current_development_scores':score(development,devrefs,'consensus5'),
+      'experimental_development_scores':devscores,'test_evaluation_reason':'user-requested comparison, not automatic promotion'}
+    if (args.out/'decision.json').exists():assert json.loads((args.out/'decision.json').read_text())==decision
+    else:save(args.out/'decision.json',decision)
+    print(json.dumps(decision),flush=True)
+    rows=read(args.trial/'sources.jsonl');refs={i:r['candidates'][0]['summary'] for i,r in read(args.trial/'reference.jsonl').items()}
+    assert len(rows)==1000 and set(rows)==set(refs)
+    generated=run(rows,args.out/'system.jsonl',client,5 if selected=='consensus5' else 1)
+    newscore=score(generated,refs,selected);oldscore=score(read(args.trial/'system.jsonl'),refs,'consensus5')
+    details=[]
+    for i,row in sorted(rows.items()):
+        hyp=pick(generated[i],selected)
+        details.append({'index':i,'original':row['text'],'reference_summary':refs[i],'summary':hyp,
+           'rouge_score':metrics(refs[i],hyp,'character')['f1'],'word_rouge_score':metrics(refs[i],hyp,'word')['f1']})
+    result={'method':'evidence_then_compression_'+selected,'sample_count':1000,'target_rouge':.65,
+      'average_rouge':newscore['character']['f1'],'average_word_rouge':newscore['word']['f1'],
+      'success_rate':sum(r['rouge_score']>=.65 for r in details)/1000,
+      'word_success_rate':sum(r['word_rouge_score']>=.65 for r in details)/1000,
+      'success_rate_definition':'fraction of individual items with F1 >= 0.65',
+      'previous_scores':oldscore,'scores':newscore,'word_improved':newscore['word']['f1']>oldscore['word']['f1'],
+      'evaluation_type':protocol['evaluation_type'],'reference_origin':protocol['reference_origin'],
+      'certificate_target_achieved':None,'evidence_fallback_count':sum(r['evidence_fallback'] for r in generated.values()),
+      'empty_count':sum(not r['summary'] for r in details),'data':details}
+    save(args.out/'scorecard.json',result)
+    print(json.dumps({k:v for k,v in result.items() if k!='data'},ensure_ascii=False,indent=2),flush=True)
+
+
+if __name__=='__main__':main()
diff --git a/scripts/evaluate_o2o_dataset.py b/scripts/evaluate_o2o_dataset.py
index 1a73cdf..6bcf126 100644
--- a/scripts/evaluate_o2o_dataset.py
+++ b/scripts/evaluate_o2o_dataset.py
@@ -8,7 +8,7 @@
 
 사용:
   python scripts/evaluate_o2o_dataset.py \
-    --data-dir /Users/marineyang/Desktop/work/code/AI_publish_3rdtest/25/plagia_result
+    --data-dir ./data/eval/plagia_result
 """
 
 from __future__ import annotations
diff --git a/scripts/export_summary_annotations.py b/scripts/export_summary_annotations.py
new file mode 100644
index 0000000..c54ff87
--- /dev/null
+++ b/scripts/export_summary_annotations.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+"""완료된 사람 요약 검수 XLSX를 ROUGE 평가용 JSONL로 내보낸다.
+
+빈 참조·미완료 행·동일 참조를 실패 처리해, 검수 전 데이터를 성적서 평가에
+실수로 사용하지 않게 한다. 원문과 작성자 그룹은 유지하되 검수자 실명은 내보내지 않는다.
+"""
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+
+REQUIRED_COLUMNS = {
+    "annotation_id", "source_group", "source_text", "reference_summary_1",
+    "reference_summary_2", "status",
+}
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("xlsx", type=Path)
+    parser.add_argument("--out", type=Path, required=True)
+    parser.add_argument("--allow-single-reference", action="store_true",
+                        help="2차 독립 검수가 끝나기 전 파일럿에만 사용")
+    args = parser.parse_args()
+
+    from openpyxl import load_workbook
+    book = load_workbook(args.xlsx, read_only=True, data_only=True)
+    if "annotations" not in book.sheetnames:
+        parser.error("annotations 시트가 없습니다")
+    sheet = book["annotations"]
+    headers = [str(cell.value or "").strip() for cell in next(sheet.iter_rows(max_row=1))]
+    positions = {name: index for index, name in enumerate(headers)}
+    missing = REQUIRED_COLUMNS - positions.keys()
+    if missing:
+        parser.error("필수 열이 없습니다: %s" % ", ".join(sorted(missing)))
+
+    rows, errors = [], []
+    for excel_row, values in enumerate(sheet.iter_rows(min_row=2, values_only=True), start=2):
+        value = lambda key: str(values[positions[key]] or "").strip()
+        status = value("status").casefold()
+        if not any(values):
+            continue
+        if status != "completed":
+            errors.append("행 %d: status가 completed가 아닙니다" % excel_row)
+            continue
+        refs = [value("reference_summary_1"), value("reference_summary_2")]
+        refs = [ref for ref in refs if ref]
+        if not args.allow_single_reference and len(refs) != 2:
+            errors.append("행 %d: 독립 참조 요약 2개가 필요합니다" % excel_row)
+            continue
+        if refs and len({" ".join(ref.split()) for ref in refs}) != len(refs):
+            errors.append("행 %d: 두 참조 요약이 동일합니다" % excel_row)
+            continue
+        if not refs or not value("source_text"):
+            errors.append("행 %d: 원문 또는 참조 요약이 비어 있습니다" % excel_row)
+            continue
+        rows.append({
+            "id": value("annotation_id"),
+            "source_group": value("source_group"),
+            "text": value("source_text"),
+            "references": refs,
+        })
+    book.close()
+    if errors:
+        print("내보내지 않음 — 검수 오류 %d건:" % len(errors))
+        print("\n".join(errors[:20]))
+        return 2
+    if not rows:
+        print("내보낼 completed 행이 없습니다")
+        return 2
+    args.out.parent.mkdir(parents=True, exist_ok=True)
+    args.out.write_text("".join(json.dumps(row, ensure_ascii=False) + "\n" for row in rows), encoding="utf-8")
+    print("저장: %s / %d건 / 작성자 그룹 %d개" %
+          (args.out, len(rows), len({row['source_group'] for row in rows})))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/improve_summary_trial.py b/scripts/improve_summary_trial.py
new file mode 100644
index 0000000..8c3136d
--- /dev/null
+++ b/scripts/improve_summary_trial.py
@@ -0,0 +1,127 @@
+"""Development-only selection followed by a fresh 1,000-source evaluation."""
+from __future__ import annotations
+
+import argparse
+import concurrent.futures
+import hashlib
+import json
+import random
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from app.engine.summary_consensus import generate_candidates, select_consensus, SHORT_SUMMARY_PROMPT
+from scripts.build_summary_trial import metrics, PROMPTS
+
+
+def read(path):
+    return [json.loads(l) for l in path.read_text().splitlines() if l.strip()]
+
+
+def save(path, value):
+    path.write_text(json.dumps(value, ensure_ascii=False, indent=2) + "\n")
+
+
+def sha(text):
+    return hashlib.sha256(text.encode()).hexdigest()
+
+
+def run_rows(rows, path, fn):
+    done = {r['id']: r for r in read(path)} if path.exists() else {}
+    with concurrent.futures.ThreadPoolExecutor(max_workers=12) as pool, path.open('a') as out:
+        pending = {pool.submit(fn, r): r['id'] for r in rows if r['id'] not in done}
+        for future in concurrent.futures.as_completed(pending):
+            rid = pending[future]
+            value = future.result()  # fail visibly; resume persisted successes
+            done[rid] = dict(value, id=rid)
+            out.write(json.dumps(done[rid], ensure_ascii=False) + '\n'); out.flush()
+            if len(done) % 50 == 0:
+                print(path.name, len(done), '/', len(rows), flush=True)
+    return done
+
+
+def summary(row, strategy):
+    texts = [c['summary'] for c in row['candidates']]
+    index = 0 if strategy == 'single' else select_consensus(texts)
+    return texts[index] if index >= 0 else ''
+
+
+def score(rows, references, generated, strategy):
+    return {mode: {key: sum(metrics(references[r['id']], summary(generated[r['id']], strategy), mode)[key]
+                            for r in rows) / len(rows) for key in ('precision','recall','f1')}
+            for mode in ('character','word')}
+
+
+def main():
+    ap=argparse.ArgumentParser(); ap.add_argument('--previous',type=Path,required=True)
+    ap.add_argument('--source',type=Path,required=True); ap.add_argument('--out',type=Path,required=True)
+    args=ap.parse_args(); args.out.mkdir(parents=True,exist_ok=True)
+    previous=read(args.previous/'sources.jsonl')
+    oldrefs={r['id']:r['summary'] for r in read(args.previous/'reference.jsonl')}
+    dev_books=set(sorted({r['source_file'] for r in previous})[:10])
+    dev=[r for r in previous if r['source_file'] in dev_books]
+    if not (args.out/'protocol.json').exists():
+        save(args.out/'protocol.json',{'development_books':sorted(dev_books),'development_count':len(dev),
+             'primary_metric':'character_bigram_f1','secondary_metric':'word_bigram_f1',
+             'strategies':['single','consensus5'],'reference_prompt':PROMPTS['reference'],
+             'system_prompt':SHORT_SUMMARY_PROMPT,'model':'gpt-4o','temperature':0.3,
+             'reference_origin':'AI-generated, unreviewed','bias':'same model and task instructions for reference and system',
+             'legacy_tokenizer_equivalence':'unconfirmed','target':0.65})
+    from app.core.config import get_settings
+    from openai import OpenAI
+    client=OpenAI(api_key=get_settings().openai_api_key,timeout=120,max_retries=3)
+    generated=run_rows(dev,args.out/'development.jsonl',lambda row:{'candidates':generate_candidates(client,row['text'])})
+    development={s:score(dev,oldrefs,generated,s) for s in ('single','consensus5')}
+    selected=max(development,key=lambda s:development[s]['character']['f1'])
+    decision={'development_scores':development,'selected':selected,'selected_before_test':True}
+    decision_path=args.out/'decision.json'
+    if decision_path.exists():
+        assert json.loads(decision_path.read_text())==decision
+    else:save(decision_path,decision)
+    print(json.dumps(decision),flush=True)
+    # Hold out entire development books and every previous trial paragraph.
+    dataset=args.out/'sources.jsonl'
+    if not dataset.exists():
+        seen={sha(' '.join(r['text'].split())) for r in previous};groups=[];rng=random.Random(20260917)
+        for p in sorted(args.source.glob('*.json')):
+            if p.name in dev_books:continue
+            group=[]
+            for r in json.loads(p.read_text()).get('results',[]):
+                text=str(r.get('source_text','')).strip();h=sha(' '.join(text.split()))
+                if not 200<=len(text)<=2000 or h in seen:continue
+                seen.add(h);group.append({'text':text,'source_file':p.name,'source_index':r.get('index'),'source_sha256':h})
+            rng.shuffle(group)
+            if group:groups.append(group)
+        rows=[]
+        while len(rows)<1000 and any(groups):
+            for g in groups:
+                if g and len(rows)<1000:rows.append(dict(g.pop(),id=len(rows)+1))
+        assert len(rows)==1000
+        dataset.write_text(''.join(json.dumps(r,ensure_ascii=False)+'\n' for r in rows))
+        save(args.out/'dataset_manifest.json',{'count':1000,'sha256':sha(dataset.read_text()),'seed':20260917,
+             'development_book_overlap':0,'previous_exact_text_overlap':0,'near_duplicate_screening':'not performed'})
+    rows=read(dataset);assert sha(dataset.read_text())==json.loads((args.out/'dataset_manifest.json').read_text())['sha256']
+    refs=run_rows(rows,args.out/'reference.jsonl',lambda r:{'candidates':generate_candidates(client,r['text'],1)})
+    reftexts={i:r['candidates'][0]['summary'] for i,r in refs.items()}
+    # Freeze candidate selection before any held-out score is calculated.
+    systems=run_rows(rows,args.out/'system.jsonl',lambda r:{'candidates':generate_candidates(client,r['text'],5 if selected=='consensus5' else 1)})
+    def baseline(row):
+        resp=client.chat.completions.create(model='gpt-4o',temperature=0.3,max_tokens=100,messages=[
+          {'role':'system','content':'당신은 텍스트 요약 전문가입니다.'},
+          {'role':'user','content':PROMPTS['candidate']+'\n\n'+row['text']}])
+        c=resp.choices[0]
+        return {'candidates':[{'summary':(c.message.content or '').strip() if c.finish_reason=='stop' else '',
+                               'finish_reason':c.finish_reason,'model':resp.model,'response_id':resp.id}]}
+    base=run_rows(rows,args.out/'baseline.jsonl',baseline)
+    result={'count':1000,'selected':selected,'reference_origin':'AI-generated, unreviewed',
+      'bias':'same model and task instructions for reference and improved system',
+      'certificate_target_achieved':None,'legacy_tokenizer_equivalence':'unconfirmed',
+      'baseline':score(rows,reftexts,base,'single'),'improved':score(rows,reftexts,systems,selected)}
+    result['primary_target_achieved']=result['improved']['character']['f1']>=0.65
+    result['quality']={label:{'empty':sum(not s for s in texts),'over50':sum(len(s)>50 for s in texts)}
+       for label,texts in [('reference',list(reftexts.values())),('baseline',[summary(base[r['id']],'single') for r in rows]),
+                          ('improved',[summary(systems[r['id']],selected) for r in rows])]}
+    save(args.out/'result.json',result);print(json.dumps(result,ensure_ascii=False,indent=2),flush=True)
+
+
+if __name__=='__main__':main()
diff --git a/scripts/refine_word_consensus.py b/scripts/refine_word_consensus.py
new file mode 100644
index 0000000..c379345
--- /dev/null
+++ b/scripts/refine_word_consensus.py
@@ -0,0 +1,70 @@
+"""Re-evaluate a development-selected word-aware selector; no new API calls.
+
+Reuses the previously inspected test set. This is a re-evaluation, not a fresh
+independent certification test. Preserve earlier artifacts and report both metrics.
+"""
+from __future__ import annotations
+import argparse
+import json
+from pathlib import Path
+import sys
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from app.engine.summary_consensus import select_consensus
+from scripts.build_summary_trial import metrics
+
+
+def read(path):
+    return {r['id']:r for r in (json.loads(l) for l in path.read_text().splitlines() if l.strip())}
+
+
+def evaluate(generated, references, weight):
+    result=[]
+    for rid,row in sorted(generated.items()):
+        texts=[c['summary'] for c in row['candidates']]
+        chosen=select_consensus(texts, word_weight=weight)
+        text=texts[chosen] if chosen>=0 else ''
+        result.append({'index':rid,'summary':text,'selected_index':chosen,
+                       'scores':{m:metrics(references[rid],text,m) for m in ('character','word')}})
+    scores={m:{k:sum(r['scores'][m][k] for r in result)/len(result)
+               for k in ('precision','recall','f1')} for m in ('character','word')}
+    return scores,result
+
+
+def main():
+    ap=argparse.ArgumentParser(description=__doc__)
+    ap.add_argument('--trial',type=Path,required=True)
+    ap.add_argument('--previous',type=Path,required=True)
+    ap.add_argument('--out',type=Path,required=True)
+    args=ap.parse_args();args.out.mkdir(parents=True,exist_ok=True)
+    dev=read(args.trial/'development.jsonl')
+    devrefs={i:r['summary'] for i,r in read(args.previous/'reference.jsonl').items()}
+    # Development comparison only; test scores do not choose this weight.
+    compared={str(w):evaluate(dev,devrefs,w)[0] for w in (0.0,0.5,1.0)}
+    weight=max((0.0,0.5,1.0),key=lambda w:compared[str(w)]['word']['f1'])
+    decision={'selected_word_weight':weight,'selection_metric':'development_word_bigram_f1',
+              'development_scores':compared,'evaluation_type':'re-evaluation of previously inspected test set'}
+    (args.out/'decision.json').write_text(json.dumps(decision,ensure_ascii=False,indent=2)+'\n')
+    systems=read(args.trial/'system.jsonl'); sources=read(args.trial/'sources.jsonl')
+    refs={i:r['candidates'][0]['summary'] for i,r in read(args.trial/'reference.jsonl').items()}
+    assert set(systems)==set(sources)==set(refs)==set(range(1,1001))
+    scores,rows=evaluate(systems,refs,weight)
+    old,_=evaluate(systems,refs,0.0)
+    full=[]
+    for row in rows:
+        i=row['index'];full.append({'index':i,'original':sources[i]['text'],
+           'reference_summary':refs[i],'summary':row['summary'],
+           'rouge_score':row['scores']['character']['f1'],'word_rouge_score':row['scores']['word']['f1']})
+    record={'method':'source_only_consensus5_char_word_equal_weight','target_rouge':0.65,
+            'average_rouge':scores['character']['f1'],'average_word_rouge':scores['word']['f1'],
+            'success_rate':sum(r['rouge_score']>=0.65 for r in full)/1000,
+            'word_success_rate':sum(r['word_rouge_score']>=0.65 for r in full)/1000,
+            'success_rate_definition':'fraction of individual items with F1 >= 0.65',
+            'sample_count':1000,'reference_origin':'AI-generated, unreviewed',
+            'reported_metric':'character_bigram_f1','secondary_metric':'word_bigram_f1',
+            'evaluation_type':decision['evaluation_type'],'certificate_target_achieved':None,
+            'previous_scores':old,'scores':scores,'data':full}
+    (args.out/'scorecard.json').write_text(json.dumps(record,ensure_ascii=False,indent=2)+'\n')
+    print(json.dumps({k:v for k,v in record.items() if k!='data'},ensure_ascii=False,indent=2))
+
+
+if __name__=='__main__':main()
diff --git a/scripts/rescore_recall.py b/scripts/rescore_recall.py
new file mode 100644
index 0000000..c479c3d
--- /dev/null
+++ b/scripts/rescore_recall.py
@@ -0,0 +1,68 @@
+"""저장된 1,000건 재채점 — 문자 2-gram recall (계획서 p.24 수식).
+
+API 재호출 없음. H절 재평가 산출물의 참조·출력 원문을 그대로 사용하고
+집계 지표만 F1 에서 recall 로 바꾼다. 새 독립 시험이 아니다.
+"""
+from __future__ import annotations
+import argparse
+import json
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from scripts.build_summary_trial import metrics
+
+TARGET = 0.65
+
+
+def main() -> None:
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument("--source", type=Path,
+                    default=Path("data/eval/summary_word_refined_20260917/scorecard.json"))
+    ap.add_argument("--out", type=Path, default=Path("data/eval/summary_recall_20260917"))
+    ap.add_argument("--excerpt", type=int, default=160, help="캡처본 원문 발췌 길이")
+    args = ap.parse_args()
+    args.out.mkdir(parents=True, exist_ok=True)
+
+    rows = json.loads(args.source.read_text())["data"]
+    scored = [{
+        "index": row["index"],
+        "original": row["original"],
+        "reference_summary": row["reference_summary"],
+        "summary": row["summary"],
+        "rouge_score": metrics(row["reference_summary"], row["summary"], "character")["recall"],
+    } for row in rows]
+
+    average = sum(r["rouge_score"] for r in scored) / len(scored)
+    provenance = {
+        "metric": "character_bigram_recall",
+        "metric_formula": "sum(match n-gram) / sum(reference n-gram)",
+        "sample_count": len(scored),
+        "reference_origin": "AI-generated (GPT-4o), unreviewed",
+        "reference_count_per_item": 1,
+        "evaluation_type": "re-evaluation of previously inspected test set",
+    }
+    scorecard = {
+        "method": "source_only_consensus5_char_word_equal_weight",
+        "target_rouge": TARGET,
+        "average_rouge": average,
+        "success_rate": sum(r["rouge_score"] >= TARGET for r in scored) / len(scored),
+        "data": scored,
+        **provenance,
+    }
+    (args.out / "scorecard.json").write_text(
+        json.dumps(scorecard, ensure_ascii=False, indent=2) + "\n")
+
+    capture = dict(scorecard)
+    capture["data"] = [{**r, "original": r["original"][:args.excerpt] + " …"}
+                       for r in scored[:3]]
+    (args.out / "capture.json").write_text(
+        json.dumps(capture, ensure_ascii=False, indent=2) + "\n")
+
+    print(f"문자 2-gram recall 평균 {average * 100:.2f}%  "
+          f"(목표 {TARGET * 100:.0f}%, {len(scored)}건)")
+    print(f"success_rate {scorecard['success_rate'] * 100:.1f}%")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/tune_summarizer.py b/scripts/tune_summarizer.py
new file mode 100644
index 0000000..befee30
--- /dev/null
+++ b/scripts/tune_summarizer.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+"""사람 참조 요약으로 추출 전략을 고르고, 잠금 테스트셋에서 한 번만 측정한다.
+
+선택(검증)과 최종 보고(테스트)를 분리해, 65점에 맞춰 전 평가 요약문을 수정하는
+전 차수식 접근을 방지한다. source_group 단위로 분리하므로 같은 작성자의 문장이
+튜닝·시험 양쪽에 섞이지 않는다.
+"""
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT))
+
+from app.engine.rouge import evaluate_pairs
+from app.engine.summarizer import extractive_summary
+
+
+def stable_bucket(group: str, seed: int) -> int:
+    return int(hashlib.sha256((str(seed) + ":" + group).encode()).hexdigest()[:8], 16) % 100
+
+
+def split_rows(rows: list[dict], seed: int) -> tuple[list[dict], list[dict]]:
+    # 20% 그룹을 최종 시험에 잠근다. 나머지에서만 전략을 고른다.
+    test = [row for row in rows if stable_bucket(row.get("source_group", row["id"]), seed) < 20]
+    validation = [row for row in rows if row not in test]
+    if not test or not validation:
+        raise ValueError("그룹 분할 결과가 비었습니다. source_group을 확인하세요.")
+    return validation, test
+
+
+def score(rows: list[dict], ratio: float, strategy: str, mode: str) -> dict[str, dict[str, float]]:
+    pairs = [
+        (extractive_summary(row["text"], ratio=ratio, strategy=strategy).final, row["references"])
+        for row in rows
+    ]
+    return evaluate_pairs(pairs, mode=mode)
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("dataset", type=Path, help="export_summary_annotations.py 출력 JSONL")
+    parser.add_argument("--out", type=Path, required=True, help="선택 근거와 잠금 시험 결과 JSON")
+    parser.add_argument("--seed", type=int, default=20260916)
+    parser.add_argument("--mode", choices=["lemma", "char"], default="lemma")
+    parser.add_argument("--ratios", type=float, nargs="+", default=[0.25, 0.30, 0.35],
+                        help="사전 등록 가능한 요약 비율 후보(권장 25~35%%)")
+    args = parser.parse_args()
+    if any(not 0 < ratio <= 0.35 for ratio in args.ratios):
+        parser.error("요약 비율은 0보다 크고 0.35 이하여야 합니다")
+    rows = [json.loads(line) for line in args.dataset.read_text(encoding="utf-8").splitlines() if line.strip()]
+    if len(rows) < 20:
+        parser.error("최소 20건 이상의 완료된 사람 참조 요약이 필요합니다")
+    validation, test = split_rows(rows, args.seed)
+    candidates = []
+    for strategy in ("textrank", "coverage", "lead"):
+        for ratio in args.ratios:
+            metrics = score(validation, ratio, strategy, args.mode)
+            candidates.append({"strategy": strategy, "ratio": ratio, "validation": metrics})
+    # 같은 recall이면 ROUGE-L F1, 더 짧은 출력 순으로 결정한다.
+    winner = max(candidates, key=lambda item: (
+        item["validation"]["rouge1"]["recall"],
+        item["validation"]["rougeL"]["f1"],
+        -item["ratio"],
+    ))
+    final = score(test, winner["ratio"], winner["strategy"], args.mode)
+    record = {
+        "purpose": "summary strategy selection with source-group-held-out final test",
+        "dataset": str(args.dataset), "seed": args.seed, "tokenization": args.mode,
+        "samples": {"total": len(rows), "validation": len(validation), "locked_test": len(test)},
+        "candidates": candidates, "selected": {"strategy": winner["strategy"], "ratio": winner["ratio"]},
+        "locked_test_scores": final,
+        "reported_metric": "rouge1_recall",
+        "target": 0.65,
+        "achieved": final["rouge1"]["recall"] >= 0.65,
+    }
+    args.out.parent.mkdir(parents=True, exist_ok=True)
+    args.out.write_text(json.dumps(record, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+    print("선택: %s / ratio=%.2f" % (winner["strategy"], winner["ratio"]))
+    print("잠금 테스트 ROUGE-1 recall: %.4f (%s)" %
+          (final["rouge1"]["recall"], "달성" if record["achieved"] else "미달"))
+    print("근거 저장: %s" % args.out)
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/verify_grounded_summary.py b/scripts/verify_grounded_summary.py
new file mode 100644
index 0000000..dec2a5e
--- /dev/null
+++ b/scripts/verify_grounded_summary.py
@@ -0,0 +1,53 @@
+"""Offline evidence and F1 verification for the two-stage experiment."""
+from __future__ import annotations
+import argparse
+from collections import Counter
+import hashlib
+import json
+from pathlib import Path
+import re
+import sys
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from app.engine.summary_consensus import select_consensus
+
+
+def rows(path):
+    items=[json.loads(l) for l in path.read_text().splitlines() if l.strip()]
+    assert len(items)==1000 and {r['id'] for r in items}==set(range(1,1001))
+    return {r['id']:r for r in items}
+
+
+def main():
+    ap=argparse.ArgumentParser(description=__doc__)
+    ap.add_argument('--trial',type=Path,required=True)
+    ap.add_argument('--experiment',type=Path,required=True)
+    a=ap.parse_args();sources=rows(a.trial/'sources.jsonl');refs=rows(a.trial/'reference.jsonl')
+    outputs=rows(a.experiment/'system.jsonl');result=json.loads((a.experiment/'scorecard.json').read_text())
+    protocol=json.loads((a.experiment/'protocol.json').read_text())
+    assert hashlib.sha256((a.trial/'sources.jsonl').read_bytes()).hexdigest()==protocol['test_source_sha256']
+    strategy=json.loads((a.experiment/'decision.json').read_text())['selected_experimental_strategy']
+    details={r['index']:r for r in result['data']};assert len(details)==len(result['data'])==1000
+    total={'character':0.,'word':0.}
+    for rid in range(1,1001):
+        row=outputs[rid];text=sources[rid]['text']
+        assert all(e in text and 1<=len(e)<=120 for e in row['evidence'])
+        assert len(row['evidence'])<=3
+        summaries=[c['summary'] for c in row['candidates']]
+        i=select_consensus(summaries,.5) if strategy=='consensus5' else (0 if summaries[0] and len(summaries[0])<=50 else -1)
+        hyp=summaries[i] if i>=0 else '';ref=refs[rid]['candidates'][0]['summary']
+        assert details[rid]['summary']==hyp and details[rid]['reference_summary']==ref and details[rid]['original']==text
+        for mode in total:
+            def grams(t):
+                t=list(re.sub(r'\s+','',t)) if mode=='character' else t.split()
+                return Counter(zip(t,t[1:]))
+            x,y=grams(ref),grams(hyp);denom=sum(x.values())+sum(y.values())
+            f1=2*sum(min(n,y[g]) for g,n in x.items())/denom if denom else 0
+            assert abs(f1-details[rid]['rouge_score' if mode=='character' else 'word_rouge_score'])<1e-12
+            total[mode]+=f1/1000
+    for mode,avg in total.items():
+        assert abs(avg-result['scores'][mode]['f1'])<1e-12
+        print(mode,'F1=%.6f%%'%(100*avg))
+    print('PASS: 1000 IDs, unchanged sources/references, literal evidence, selected outputs, per-item and mean F1')
+
+
+if __name__=='__main__':main()
diff --git a/scripts/verify_summary_improvement.py b/scripts/verify_summary_improvement.py
new file mode 100644
index 0000000..cbc4eb5
--- /dev/null
+++ b/scripts/verify_summary_improvement.py
@@ -0,0 +1,60 @@
+"""Recompute the frozen improvement trial locally, without model/API calls."""
+from __future__ import annotations
+
+import argparse
+from collections import Counter
+import hashlib
+import json
+from pathlib import Path
+import re
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from app.engine.summary_consensus import select_consensus
+
+
+def load_rows(path):
+    rows = [json.loads(line) for line in path.read_text().splitlines() if line.strip()]
+    assert len(rows) == 1000 and {r['id'] for r in rows} == set(range(1, 1001)), path
+    return {r['id']: r for r in rows}
+
+
+def main():
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument('directory', type=Path)
+    args = ap.parse_args()
+    p = args.directory
+    manifest = json.loads((p/'dataset_manifest.json').read_text())
+    assert hashlib.sha256((p/'sources.jsonl').read_bytes()).hexdigest() == manifest['sha256']
+    sources = load_rows(p/'sources.jsonl')
+    protocol = json.loads((p/'protocol.json').read_text())
+    assert not ({r['source_file'] for r in sources.values()} & set(protocol['development_books']))
+    refs = load_rows(p/'reference.jsonl')
+    systems = load_rows(p/'system.jsonl')
+    baseline = load_rows(p/'baseline.jsonl')
+    result = json.loads((p/'result.json').read_text())
+    for label, outputs in [('baseline', baseline), ('improved', systems)]:
+        for mode in ('character', 'word'):
+            totals = {'precision': 0.0, 'recall': 0.0, 'f1': 0.0}
+            for rid in range(1, 1001):
+                candidates = [c['summary'] for c in outputs[rid]['candidates']]
+                chosen = select_consensus(candidates) if label == 'improved' and result['selected'] == 'consensus5' else 0
+                hyp = candidates[chosen] if chosen >= 0 else ''
+                ref = refs[rid]['candidates'][0]['summary']
+                def grams(text):
+                    tokens = list(re.sub(r'\s+', '', text)) if mode == 'character' else text.split()
+                    return Counter(zip(tokens, tokens[1:]))
+                a, b = grams(ref), grams(hyp)
+                overlap = sum(min(count, b[g]) for g, count in a.items())
+                a_total, b_total = sum(a.values()), sum(b.values())
+                totals['precision'] += overlap / b_total if b_total else 0.0
+                totals['recall'] += overlap / a_total if a_total else 0.0
+                totals['f1'] += 2 * overlap / (a_total + b_total) if a_total + b_total else 0.0
+            actual = {key: value/1000 for key, value in totals.items()}
+            assert all(abs(actual[key]-result[label][mode][key]) < 1e-12 for key in actual)
+            print(label, mode, 'F1=%.6f%%' % (actual['f1']*100))
+    print('PASS: 1000 IDs, source SHA-256, development-book exclusion, all P/R/F1 values')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tests/test_summarizer.py b/tests/test_summarizer.py
index 0eeed10..8ac5387 100644
--- a/tests/test_summarizer.py
+++ b/tests/test_summarizer.py
@@ -66,6 +66,18 @@ def test_emphasis_prioritizes_requested_topic():
     assert result.emphasis == ["김밥"]
 
 
+def test_coverage_strategy_preserves_source_order_and_respects_cap():
+    result = extractive_summary(_DOC, ratio=0.5, max_sentences=3, strategy="coverage")
+    assert result.selected_indices == sorted(result.selected_indices)
+    assert result.num_sentences_out == 3
+
+
+def test_unknown_extractive_strategy_is_rejected():
+    import pytest
+    with pytest.raises(ValueError):
+        extractive_summary(_DOC, strategy="oracle")
+
+
 def test_empty_and_short():
     assert extractive_summary("").final == ""
     one = extractive_summary("한 문장만 있다.")
diff --git a/tests/test_summary_consensus.py b/tests/test_summary_consensus.py
new file mode 100644
index 0000000..0377d42
--- /dev/null
+++ b/tests/test_summary_consensus.py
@@ -0,0 +1,40 @@
+from app.engine.summary_consensus import character_f1, select_consensus
+
+
+def test_medoid_prefers_agreed_event_over_outlier():
+    candidates = ["김씨는 학교를 세웠다.", "김씨는 학교를 세웠다.", "김씨는 미국으로 이민했다."]
+    assert select_consensus(candidates) == 0
+
+
+def test_overlength_consensus_cannot_win():
+    long = "긴" * 51
+    assert select_consensus([long, long, "학교를 세웠다."]) == 2
+    assert select_consensus([long, ""]) == -1
+
+
+def test_empty_outputs_do_not_change_candidate_choice():
+    assert select_consensus(["", "학교를 세웠다.", "학교를 세웠다."]) == 1
+    assert character_f1("", "") == 0
+
+
+def test_bigram_overlap_keeps_multiplicity():
+    assert character_f1("가가가", "가가") == 2 / 3
+
+
+def test_word_overlap_and_invalid_weight():
+    import pytest
+    from app.engine.summary_consensus import word_f1
+    assert word_f1("a b c", "a b") == 2 / 3
+    assert word_f1("a", "a") == 0
+    with pytest.raises(ValueError):
+        select_consensus(["요약"], word_weight=1.5)
+
+
+def test_public_summary_reports_invalid_when_every_candidate_fails(monkeypatch):
+    from app.engine import summary_consensus
+    monkeypatch.setattr(summary_consensus, "generate_candidates", lambda client, text: [
+        {"summary": "", "finish_reason": "length"}, {"summary": "긴" * 51, "finish_reason": "stop"}])
+    result = summary_consensus.summarize_short(None, "원문")
+    assert result["valid"] is False
+    assert result["summary"] == ""
+    assert result["selected_index"] == -1
diff --git a/tests/test_summary_grounded.py b/tests/test_summary_grounded.py
new file mode 100644
index 0000000..226a1a3
--- /dev/null
+++ b/tests/test_summary_grounded.py
@@ -0,0 +1,14 @@
+from app.engine.summary_grounded import validated_evidence
+
+
+def test_evidence_rejects_paraphrases_and_nonstrings():
+    assert validated_evidence('그는 학교를 세웠다.', {'evidence':['학교를 세웠다','학교를 설립했다',42,'']}) == ['학교를 세웠다']
+
+
+def test_evidence_deduplicates_and_caps():
+    assert validated_evidence('가 나 다 라', {'evidence':['가','가','나','다','라']}) == ['가','나','다']
+
+
+def test_bad_schema_and_overlength_are_not_evidence():
+    assert validated_evidence('원문', {'evidence':'원문'}) == []
+    assert validated_evidence('가'*121, {'evidence':['가'*121]}) == []