feat(detections): add 3 semantic labels (log_content, stack_trace, diff_patch)

docs/accuracy_runs/2026-04-10-iteration-16-audit-report.md

@@ -0,0 +1,77 @@
+# Iter16 Semantic Label Audit Report
+
+**Date:** 2026-04-10
+**Models:** gemini3flash, sonnet, gpt54mini
+
+## Pass Criteria
+
+1. Inter-annotator agreement >=0.995 on stratified 5k for ALL labels.
+2. Recall (majority >=2 of 3) >=0.9 on injected positives.
+3. Zero obvious rule violations in spot-check (manual).
+
+## Criterion 1: Inter-Annotator Agreement (stratified 5k)
+
+| Label | Agreement | Pass |
+|---|---:|:---:|
+| c_cpp | 0.9940 | FAIL |
+| csharp | 0.9998 | PASS |
+| css | 0.9973 | PASS |
+| csv | 0.9994 | PASS |
+| diff_patch | 0.9999 | PASS |
+| dockerfile | 0.9999 | PASS |
+| fixed_width | 0.9922 | FAIL |
+| go | 0.9994 | PASS |
+| graphql | 0.9998 | PASS |
+| html | 0.9910 | FAIL |
+| ini | 0.9918 | FAIL |
+| java | 0.9987 | PASS |
+| javascript | 0.9923 | FAIL |
+| json | 0.9947 | FAIL |
+| jsonl | 0.9981 | PASS |
+| key_value | 0.9775 | FAIL |
+| kotlin | 0.9998 | PASS |
+| latex | 0.9922 | FAIL |
+| log_content | 0.9986 | PASS |
+| lua | 0.9997 | PASS |
+| makefile | 0.9965 | PASS |
+| markdown | 0.9507 | FAIL |
+| objc | 0.9999 | PASS |
+| php | 0.9995 | PASS |
+| pipe_table | 0.9971 | PASS |
+| plain | 0.9391 | FAIL |
+| powershell | 0.9997 | PASS |
+| python | 0.9981 | PASS |
+| r | 0.9998 | PASS |
+| rst | 0.9975 | PASS |
+| ruby | 0.9999 | PASS |
+| rust | 0.9999 | PASS |
+| sgml | 0.9976 | PASS |
+| shell | 0.9850 | FAIL |
+| sql | 0.9990 | PASS |
+| stack_trace | 0.9997 | PASS |
+| swift | 0.9999 | PASS |
+| toml | 0.9987 | PASS |
+| tsv | 0.9988 | PASS |
+| typescript | 0.9978 | PASS |
+| xml | 0.9975 | PASS |
+| yaml | 0.9949 | FAIL |
+
+**Criterion 1 verdict: FAIL**
+
+## Criterion 2: Recall on Injected Positives
+
+| Label | Recall (majority) | Pass |
+|---|---:|:---:|
+| diff_patch | 1.0000 | PASS |
+| log_content | 0.8400 | FAIL |
+| stack_trace | 0.6250 | FAIL |
+
+**Criterion 2 verdict: FAIL**
+
+## Criterion 3: Spot-Check Rule Violations
+
+_Manual review required -- scan disagreement rows and injected positives for obvious rule violations (e.g., log_content firing on lowercase error in prose)._
+
+## Overall Decision
+
+**Gate: FAIL.** Iterate on label definitions; re-run audit.