docs(docs): add frontmatter to test plans, test reports, and audits

Standardized YAML frontmatter on 7 files across docs/test-plans/,
docs/test-reports/, and docs/audits/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/test-reports/pr-004-protocol-codec-review.md

@@ -1,3 +1,13 @@
+---
+title: "PR #4 Protocol Codec Review"
+description: "QA review of PR #4 implementing the MessagePack-based wire protocol for Rust-Godot IPC. Verdict: REQUEST_CHANGES — 5 critical issues and 8 warnings identified covering missing enum variant, type coercion, error handling, and negative test gaps."
+type: test-report
+status: archived
+ticket: "#4"
+created: 2026-02-11
+updated: 2026-02-26
+---
+
 # Test Report: PR #4 Protocol Codec Review
 
 - **Date**: 2026-02-11

docs/test-reports/sprint-11-522-preliminary.md

@@ -1,3 +1,13 @@
+---
+title: "Sprint 11 #522 Preliminary Review"
+description: "Preliminary QA review of the OQ-07 no-insert interaction implementation (#522). Confirms option (a) cursor shape changes with verb labels suppressed. Approved pending final test run."
+type: test-report
+status: archived
+ticket: "#522"
+created: 2026-02-19
+updated: 2026-02-19
+---
+
 # Preliminary Review: #522 OQ-07 Implementation
 
 - **Date**: 2026-02-19

docs/test-reports/sprint-11-combine-final.md

@@ -1,3 +1,13 @@
+---
+title: "Sprint 11 Combine Final Report"
+description: "Final QA test report for Sprint 11 covering #522 (OQ-07 no-insert interaction) and #507 (WRONG button ring buffer). Both approved with 2 bugs found and fixed during QA. All sprint-specific tests pass."
+type: test-report
+status: archived
+ticket: "#507, #522"
+created: 2026-02-19
+updated: 2026-02-19
+---
+
 # Test Report: Sprint 11 — Combine (#522 + #507)
 
 - **Date**: 2026-02-19