feat: add openclaw-plugin-dev skill

Plugin development reference and workflows based on real development
experience (Dirigent, ContractorAgent, PrismFacet).

Docs: structure, entry-point, hooks, tools, state, config, debugging
Workflows: create-plugin, add-hook

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

openclaw-plugin-dev/docs/debugging.md

@@ -0,0 +1,46 @@
+# Development & Debugging
+
+## Dev Loop
+
+```bash
+# 1. Modify code in plugin/
+# 2. Reinstall
+node scripts/install.mjs --install
+
+# 3. Restart gateway
+openclaw gateway restart
+
+# 4. Watch logs
+openclaw logs --follow
+
+# 5. Test
+```
+
+## Log Keywords
+
+| Keyword | Meaning |
+|---------|---------|
+| `plugin registered` | register() completed |
+| `startSideCar called` / `already running` | Sidecar status |
+| `must NOT have additional properties` | Schema vs config mismatch |
+| `EADDRINUSE` | Port conflict (sidecar or HTTP server) |
+
+## Checklist Before Deploy
+
+### General
+
+- [ ] All hook handlers have event dedup (globalThis, not module-level)
+- [ ] Gateway lifecycle events protected by globalThis flag
+- [ ] Business state on globalThis
+- [ ] `openclaw.plugin.json` schema matches actual config fields
+- [ ] Install script doesn't set schema-absent fields
+- [ ] Sensitive fields not set by install script
+- [ ] Install script cleans old dist before copying
+
+### Connection-type plugins
+
+- [ ] Start flag on globalThis (not module-level `let`)
+- [ ] Runtime reference on globalThis
+- [ ] Shared registries/callbacks on globalThis, init once
+- [ ] Cross-plugin API object overwritten every register() but runtime started once
+- [ ] Consumer plugins defend against provider not loaded