chore(track): gatekeeper-v2-20260331 start implementation

Author: amondnet

.please/docs/tracks/active/gatekeeper-v2-20260331/metadata.json

@@ -1,9 +1,9 @@
 {
   "track_id": "gatekeeper-v2-20260331",
   "type": "feature",
-  "status": "planned",
+  "status": "in_progress",
   "created_at": "2026-03-31T21:18:46+09:00",
-  "updated_at": "2026-03-31T21:30:00+09:00",
+  "updated_at": "2026-03-31T21:35:00+09:00",
   "issue": "#135",
   "pr": "",
   "project": ""

.please/docs/tracks/index.md

@@ -13,7 +13,7 @@
 | [web-nuxt-update-20260328](active/web-nuxt-update-20260328/plan.md) | Web App Dependency Update | chore | #126 | 2026-03-28 | in_progress |
 | [fix-setup-glob-pattern-20260329](active/fix-setup-glob-pattern-20260329/plan.md) | Fix setup command package.json discovery | bugfix | #129 | 2026-03-29 | in_progress |
 | [setup-monorepo-scan-20260329](active/setup-monorepo-scan-20260329/plan.md) | Monorepo Workspace Dependency Scanning | feature | #132 | 2026-03-29 | in_progress |
-| [gatekeeper-v2-20260331](active/gatekeeper-v2-20260331/plan.md) | Gatekeeper v2: All-Tool Coverage + Auto-Mode Rules | feature | #135 | 2026-03-31 | planned |
+| [gatekeeper-v2-20260331](active/gatekeeper-v2-20260331/plan.md) | Gatekeeper v2: All-Tool Coverage + Auto-Mode Rules | feature | #135 | 2026-03-31 | in_progress |
 
 ## Recently Completed