feat(adapters): external adapter plugin system with dynamic UI parser

- Plugin loader: install/reload/remove/reinstall external adapters
  from npm packages or local directories
- Plugin store persisted at ~/.paperclip/adapter-plugins.json
- Self-healing UI parser resolution with version caching
- UI: Adapter Manager page, dynamic loader, display registry
  with humanized names for unknown adapter types
- Dev watch: exclude adapter-plugins dir from tsx watcher
  to prevent mid-request server restarts during reinstall
- All consumer fallbacks use getAdapterLabel() for consistent display
- AdapterTypeDropdown uses controlled open state for proper close behavior
- Remove hermes-local from built-in UI (externalized to plugin)
- Add docs for external adapters and UI parser contract

packages/plugins/sdk/src/protocol.ts

@@ -606,7 +606,7 @@ export interface WorkerToHostMethods {
     result: IssueComment[],
   ];
   "issues.createComment": [
-    params: { issueId: string; body: string; companyId: string },
+    params: { issueId: string; body: string; companyId: string; authorAgentId?: string },
     result: IssueComment,
   ];