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

build/audits/cm95_s52_rc039_depcnt_control_flow_fix_v1.json

@@ -0,0 +1,112 @@
+{
+  "schema": "cm95.s52.rc039-depcnt-control-flow-fix/v1",
+  "date": "2026-09-21",
+  "status": "PASS",
+  "branch_id": "DC-DEC-DEP-LOW",
+  "commit": "1dbe1fde07ed64b39893de7d7e6ec5ce77cab871",
+  "opencpn_behavior": "For LINE DEPARE, when DRVAL1<=safety_contour, only DRVAL2>=safety_contour can set safe=true. The chart next-safe-contour fallback belongs exclusively to the outer else branch where DRVAL1>safety_contour.",
+  "previous_incorrect_audit_explanation": "DRVAL2<=DRVAL1 must be normalized to DRVAL1+0.01 before DEPCNT02 safety selection.",
+  "correct_root_cause": "Nested OpenCPN if/else was flattened into CM95 if/elif, making the next-safe fallback reachable in a branch where OpenCPN never evaluates it.",
+  "python_witness": [
+    {
+      "case": "low-no-cross",
+      "instruction": "LS(SOLD,1,DEPCN)",
+      "safe": false
+    },
+    {
+      "case": "cross-safety",
+      "instruction": "LS(SOLD,2,DEPSC)",
+      "safe": true
+    },
+    {
+      "case": "deep-next-safe",
+      "instruction": "LS(SOLD,2,DEPSC)",
+      "safe": true
+    }
+  ],
+  "js_runtime_witness": [
+    {
+      "case": "low-no-cross",
+      "operations": [
+        {
+          "opcode": "LS",
+          "args": [
+            "SOLD",
+            "1",
+            "DEPCN"
+          ]
+        }
+      ]
+    },
+    {
+      "case": "cross-safety",
+      "operations": [
+        {
+          "opcode": "SE",
+          "args": []
+        },
+        {
+          "opcode": "LS",
+          "args": [
+            "SOLD",
+            "2",
+            "DEPSC"
+          ]
+        }
+      ]
+    },
+    {
+      "case": "deep-next-safe",
+      "operations": [
+        {
+          "opcode": "SE",
+          "args": []
+        },
+        {
+          "opcode": "LS",
+          "args": [
+            "SOLD",
+            "2",
+            "DEPSC"
+          ]
+        }
+      ]
+    },
+    {
+      "case": "depcnt-mariner-exact",
+      "operations": [
+        {
+          "opcode": "SE",
+          "args": []
+        },
+        {
+          "opcode": "LS",
+          "args": [
+            "SOLD",
+            "2",
+            "DEPSC"
+          ]
+        }
+      ]
+    }
+  ],
+  "kyushu_v5_release_affected_feature_count": 0,
+  "rebuild_required": false,
+  "code_first_v4_counts": {
+    "PASS": 121,
+    "FAIL": 0,
+    "NOT_PROVEN": 85
+  },
+  "gates": {
+    "A": "FAIL",
+    "B": "PASS",
+    "C": "PASS",
+    "D": "PASS",
+    "E": "PASS",
+    "F": "NOT_PROVEN",
+    "G": "NOT_PROVEN",
+    "H": "PASS",
+    "I": "NOT_PROVEN"
+  },
+  "target_portrayal": "FAIL"
+}