fix(bridge): v0.3.12 approval state management — sawRunningAfterPending gate + approval-flow.md system doc

- processResponseFile: set sawRunningAfterPending=true instead of removing resets
  (prevents infinite pending loop AND known-issues L479 auto_resolve regression)
- Hoist sawRunningAfterPending to module level for cross-function access
- Add recentPendingSteps memory dedup Map (60s TTL) for file-deletion resilience
- Create docs/approval-flow.md: complete system flow guide with state diagram
- Update known-issues.md: 2 new entries (state reset fix, memory dedup)

extension/package.json

@@ -2,7 +2,7 @@
     "name": "gravity-bridge",
     "displayName": "Gravity Bridge",
     "description": "Antigravity ↔ Discord 브리지 연동 확장",
-    "version": "0.3.11",
+    "version": "0.3.12",
     "publisher": "variet",
     "engines": {
         "vscode": "^1.100.0"