docs: close RC-039 and record Code-First v4

docs/报告/CM95_S52_OpenCPN渲染流程对照审计报告_v4.md

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+# CM95 S-52 OpenCPN 渲染流程对照审计报告 v4
+
+日期：2026-09-21。固定 OpenCPN baseline：f7211b4e1874c453e37a7f190aa191c55a25c32e。
+
+## 1. 结论
+
+RC-039 修复后，206 条 branch 重新判定为：
+
+| PASS | FAIL | NOT_PROVEN | 合计 |
+|---:|---:|---:|---:|
+| 121 | 0 | 85 | 206 |
+
+Branch 层面的确认 FAIL 已清零。Target Portrayal 仍为 FAIL，原因不是 branch FAIL，而是 Gate A 仍 FAIL，Gate F/G/I 仍为 NOT_PROVEN。
+
+## 2. RC-039 正确根因
+
+v3 residual 将问题解释为“DEPCNT02 应先把 DRVAL2<=DRVAL1 规范化为 DRVAL1+0.01”，该解释不符合固定 OpenCPN 源码。
+
+固定源码真实控制流是：当 DRVAL1 <= safety_contour 时，只检查 DRVAL2 >= safety_contour；只有 DRVAL1 > safety_contour 时，才进入 outer else 并比较 chart next-safe-contour。
+
+CM95 原实现把这个嵌套 if/else 压平成 if/elif，导致 DRVAL1=2, DRVAL2=2, safety=3, chart_next=2 被错误提升为 safety contour。
+
+修复后 Python 与 Web runtime witness 均 PASS。
+
+## 3. Release 影响
+
+完整扫描当前九州 v5 的 5064 个 PBF，s52_runtime_csp=DEPCNT02 且 s52_source_object_class=DEPARE 的 feature 数为 0。因此当前 release 没有实际受影响对象，本次无需重建九州 release；代码修复保证未来出现该分支时行为与 OpenCPN 一致。
+
+## 4. Gate A-I
+
+| Gate | 状态 | 结论 |
+|---|---|---|
+| A OPENCPN_FLOW_EQUIVALENCE | FAIL | $AREAS II25→BACKGROUND normalization remains absent; lookup '?' scoring/numeric/fallback semantics are not fully identical to the fixed parser. |
+| B CSP_BRANCH_EQUIVALENCE | PASS | All 206 branch rows have no remaining confirmed CSP branch mismatch after the RC-039 DEPCNT control-flow fix. |
+| C NESTED_CSP_CALL_GRAPH | PASS | Phase A/C witnesses prove ordered OBSTRN/WRECKS quality, name and sounding suffix expansion. |
+| D INSTRUCTION_SEQUENCE_EQUIVALENCE | PASS | Versioned mixed-opcode rule IR preserves lookup+CSP order and structured TX operands. |
+| E RUNTIME_OPCODE_COVERAGE | PASS | Generic executor and specialized SOUNDG/LIGHTS/CA paths execute the required ordered opcodes; missing DANGER53 does not discard the suffix. |
+| F REAL_DATA_BRANCH_COVERAGE | NOT_PROVEN | The v5 release is complete, but delivery fields do not uniquely reconstruct every source predicate/association/view state. |
+| G RESOURCE_DEPENDENCY_EQUIVALENCE | NOT_PROVEN | The local resource contract passes, but the fixed OpenCPN snapshot contains no independent chartsymbols.xml; DANGER53/LOWACC03 equivalence remains unprovable. |
+| H MARINER_DEPENDENCY_EQUIVALENCE | PASS | Mariner-dependent depth/height/boundary/category/SCAMIN paths are covered by phase witnesses plus the corrected DEPCNT DEPARE safety-contour control flow. |
+| I RENDER_ORDER_EQUIVALENCE | NOT_PROVEN | OP no-op and multi-LS execution are corrected; cross-object/global pass interleaving is still outside the available snapshot and witnesses. |
+
+## 5. 交付
+
+- 机器审计：build/audits/cm95_s52_opencpn_code_first_equivalence_v4.json
+- RC-039 证据：build/audits/cm95_s52_rc039_depcnt_control_flow_fix_v1.json
+- 代码 commit：1dbe1fde07ed64b39893de7d7e6ec5ce77cab871

docs/报告/CM95_S52_RC039_DEPCNT控制流修复报告_v1.md

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+# CM95 S-52 RC-039 DEPCNT 控制流修复报告 v1
+
+日期：2026-09-21。
+
+## 结论
+
+RC-039 已修复并通过 Python / Web runtime 双 witness。正确根因是 OpenCPN 嵌套 if/else 在 CM95 中被错误压平成 if/elif，不是 DRVAL2 的 +0.01 规范化问题。
+
+- Branch：DC-DEC-DEP-LOW
+- 修复 commit：1dbe1fde07ed64b39893de7d7e6ec5ce77cab871
+- Python witness：PASS
+- Web runtime witness：PASS
+- 当前九州 v5 release 受影响 feature：0
+- Code-First v4：PASS 121 / FAIL 0 / NOT_PROVEN 85
+- Gate B：PASS
+- Gate H：PASS
+- Target Portrayal：FAIL（Gate A 仍 FAIL；Gate F/G/I 为 NOT_PROVEN）