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-plans/sprint-11-combine.md

@@ -1,3 +1,13 @@
+---
+title: "Sprint 11 Combine — #507 and #522"
+description: "Test plan for Sprint 11 combining WRONG button ring buffer (#507) and OQ-07 no-insert interaction behaviour (#522), covering happy paths, edge cases, integration, and performance tests."
+type: test-plan
+status: active
+ticket: "#507, #522"
+created: 2026-02-19
+updated: 2026-02-19
+---
+
 # Test Plan: Sprint 11 Combine — #507 and #522
 
 - **Date**: 2026-02-19

docs/test-plans/sprint-18-client.md

@@ -1,3 +1,13 @@
+---
+title: "Sprint 18 — Touch (Client)"
+description: "Test plan for Sprint 18 client scope covering minimap POI rendering (#151), dialogue UI hardening and examine result display (#174), and knowledge/journal panel (#264)."
+type: test-plan
+status: active
+ticket: "#151, #174, #264"
+created: 2026-02-25
+updated: 2026-02-25
+---
+
 # Test Plan: Sprint 18 — Touch (Client)
 
 - **Date**: 2026-02-25