feat(check): 响应方式识别（C12）和「这条要不要投标人回答」；评测集纠错

- checklist/response_mode.py：按类别（技术 / 商务）识别招标文件的响应方式（逐条响应 / 默认接受），规则优先；
  两种写法冲突按逐条，认不出按逐条并写进覆盖范围。
- check/applicability.py：无效情形（★ / 斜体下划线标注的条款除外）、日期与递交、没要求附材料的评分标准、
  无需提供证明或由采购人查询的资格，不逐条找响应，写进覆盖范围；要求附证明材料按原文判断，中标后才交的不算。
- 默认接受的要求没找到响应：一般要求记 implicit_accepted、不出问题；实质性要求记 implicit_review、提示级
  人工核对；要附证明材料的不免（迁移 0006）。
- match.py：修同一行单元格又是别的条目候选句时的 KeyError（每条清单项单独记候选句，句子从总表里查）。
- 评测集：注入器同一要求的所有表格行一起改；散文、附件、格式文件里也响应了的要求不挂漏响应类问题；
  错位响应必须是另一个参数；复核判不成立的单元不再挂；regen.py 按固定种子重新生成。

开发集 17 份：规矩投标文件报出的问题 639 → 229，误报 21.3 → 12.4 / 100，召回 68% → 65%，致命级 20 → 21 / 32
（docs/architecture/check-eval.md §4）。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/tests/test_check_units.py

@@ -77,3 +77,57 @@ def test_no_value_is_a_hint_and_unverified_is_explained() -> None:
     )
     assert uv is not None and uv.severity == "fatal" and "第 3 页" in uv.explanation and "没能核对" in uv.explanation
     assert findings.spec(match.Result("responded", "model", "verified"), item) is None
+
+
+def test_response_mode_by_category() -> None:
+    from bid_doctor.checklist import response_mode
+
+    sents = [
+        sent(1, "技术规格偏离表"),
+        sent(2, "投标人应将所有偏离的条目列入上表，未列入上表的视作投标人完全接受。"),
+        sent(3, "商务条款偏离表"),
+        sent(4, "投标人须对商务要求逐条作出响应。"),
+    ]
+    m = response_mode.detect(sents)
+    assert (m["technical"].mode, m["technical"].status) == ("implicit", "found")
+    assert (m["commercial"].mode, m["commercial"].status) == ("explicit", "found")
+    both = response_mode.detect([sent(1, "须逐项作出响应。"), sent(2, "否则将认为投标人接受招标文件的要求。")])
+    assert (both["technical"].mode, both["technical"].status) == ("explicit", "conflict")  # 写法冲突按逐条（C12）
+    none = response_mode.detect([sent(1, "本项目为货物采购。")])
+    assert (none["commercial"].mode, none["commercial"].status) == ("explicit", "unknown")
+
+
+def test_applicability_skips_items_that_need_no_response() -> None:
+    from bid_doctor.check import applicability
+    from bid_doctor.checklist import response_mode
+
+    modes = response_mode.detect([sent(1, "未列入偏离表的技术要求视作投标人完全接受。")])
+    decide = applicability.decide
+    assert decide({"categories": ["invalidity"], "importance_basis": "tender_text"}, modes).skip == "condition"
+    assert decide({"categories": ["invalidity"], "importance_basis": "marker"}, modes).match  # ★ 条款是要求
+    assert decide({"categories": ["schedule"]}, modes).skip == "schedule"
+    assert decide({"categories": ["scoring"]}, modes).skip == "scoring"
+    assert decide({"categories": ["scoring"], "evidence_required": "业绩合同"}, modes).match
+    assert decide({"categories": ["scoring"], "title": "业绩（2 分）：提供近三年类似项目合同复印件"}, modes).match
+    assert (
+        decide({"categories": ["scoring"], "title": "提供检测报告，中标后签订合同前提供原件"}, modes).skip == "scoring"
+    )
+    assert decide({"categories": ["tech_param"], "title": "支持硬件BFD，提供官网截图证明"}, modes).evidence
+    assert decide({"categories": ["qualification"], "title": "未被列入信用中国失信名单"}, modes).skip == "no_proof"
+    d = decide({"categories": ["tech_param"], "title": "内存"}, modes)
+    assert d.match and d.mode == "implicit"
+
+
+def test_implicit_not_found_is_accepted_but_substantive_gets_a_hint() -> None:
+    from uuid import uuid4
+
+    from bid_doctor.check import applicability
+
+    a, b = uuid4(), uuid4()
+    results = {a: match.Result("not_found", "model"), b: match.Result("not_found", "model")}
+    items = {a: {"importance": "normal"}, b: {"importance": "substantive", "title": "★双电源"}}
+    decisions = {a: applicability.Decision(True, mode="implicit"), b: applicability.Decision(True, mode="implicit")}
+    match.apply_modes(results, items, decisions)
+    assert results[a].verdict == "implicit_accepted" and findings.spec(results[a], items[a]) is None
+    spec = findings.spec(results[b], items[b])
+    assert results[b].verdict == "implicit_review" and spec is not None and spec.severity == "hint"