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

ui/src/components/agent-config-primitives.tsx

@@ -57,17 +57,9 @@ export const help: Record<string, string> = {
   budgetMonthlyCents: "Monthly spending limit in cents. 0 means no limit.",
 };
 
-export const adapterLabels: Record<string, string> = {
-  claude_local: "Claude (local)",
-  codex_local: "Codex (local)",
-  gemini_local: "Gemini CLI (local)",
-  opencode_local: "OpenCode (local)",
-  openclaw_gateway: "OpenClaw Gateway",
-  cursor: "Cursor (local)",
-  hermes_local: "Hermes Agent",
-  process: "Process",
-  http: "HTTP",
-};
+import { getAdapterLabels } from "../adapters/adapter-display-registry";
+
+export const adapterLabels = getAdapterLabels();
 
 export const roleLabels = AGENT_ROLE_LABELS as Record<string, string>;