feat(review): 审查结论改为结构化 JSON，移除二次 LLM 抽取

- checklist.py：系统提示加入结构化输出契约（只输出 {summary, issues[]}，
  引用 handle 必须真实存在、不得编造）
- review.py：review_frame 返回 {summary, issues, raw}；仅在「不再请求工具」的回合
  解析结论，中间工具回合的 content 永不解析；强制收口那次 chat 不传 tools
- report.py：删除 extract_issues 与 _EXTRACT_SYSTEM（不再需要第二次 LLM 调用）；
  新增 format_finding（用 .get，顺带修复缺 frame 键 KeyError）；save_report 的
  issues 省略时从 findings 拍平
- __main__.py：主流程改为 确定性检查 → review_frame → build_finding（合并+校验），
  issues 由 flatten_issues 派生

顺带修复既有 gap：summarize 硬下标 KeyError、extract_issues 单行围栏解析失败。

dwg_review/__main__.py

@@ -6,6 +6,8 @@ import sys
 from pathlib import Path
 
 from . import config
+from . import checks as checks_phase
+from . import findings as findings_mod
 from .annotator import annotate, clear
 from .checklist import build_system_prompt, checklist_summary
 from .context import ReviewContext
@@ -80,25 +82,35 @@ def run_review(ctx, args):
         print(f"[evidence] 已写入 {path}")
         return 0
 
-    print("[3/4] 审查：逐图框 LLM 审查（含受控只读取证子循环） ...")
-    findings = []
+    print("[3/4] 审查：确定性检查前置 + 逐图框 LLM 审查（含受控只读取证子循环） ...")
+    frame_findings = []
     for ev in evidences:
         print(f"  - 审查图框 {ev['index']} ...")
-        text = review.review_frame(ctx, ev, system_prompt)
-        findings.append(
-            {
-                "frame": ev["index"],
-                "sheet": (ev.get("frame") or {}).get("sheet_size"),
-                "finding": text,
-            }
+        checks = (
+            checks_phase.run_deterministic_checks(ctx, ev)
+            if config.DETERMINISTIC_CHECKS
+            else []
+        )
+        conclusion = review.review_frame(ctx, ev, system_prompt)
+        finding = findings_mod.build_finding(
+            ev, conclusion, checks, validate_handles=config.VALIDATE_HANDLES
+        )
+        frame_findings.append(finding)
+
+        counts = finding["counts"]
+        preview = finding["summary"]
+        if len(preview) > 200:
+            preview = preview[:200] + "..."
+        print(
+            f"    结论：{preview}"
+            f"（确定性 {counts['deterministic']} / LLM {counts['llm']}"
+            f" / 未核实 {counts['unverified']}）"
         )
-        preview = text if len(text) <= 200 else text[:200] + "..."
-        print(f"    结论：{preview}")
 
     print("[4/4] 汇总报告 ...")
-    markdown = report.summarize(ctx, findings)
-    issues = report.extract_issues(ctx, findings)
-    report.save_report(markdown, findings, plan, issues)
+    markdown = report.summarize(ctx, frame_findings)
+    issues = findings_mod.flatten_issues(frame_findings)
+    report.save_report(markdown, frame_findings, plan, issues)
     print()
     print(markdown)