chore: VC pattern analysis + Deacon simplification

- Add gt-zhpa epic: VC Pattern Integration (6 child tasks)
  Extracted validated ideas from ~/src/vc that map to Gas Town primitives

- Close gt-5af: Deacon epic as over-engineered
  Problem solved by hooks + gt prime

- Create lightweight successors:
  - gt-htto: Heartbeat convention
  - gt-bnch: Human escalation

- Disable beads MCP plugin for Gas Town
  CLI works; MCP adds complexity without value

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.json

@@ -1,4 +1,7 @@
 {
+  "enabledPlugins": {
+    "beads@beads-marketplace": false
+  },
   "hooks": {
     "SessionStart": [
       {