fix(plugin): load local toolkit and expose status tool

TODO.md

@@ -10,8 +10,9 @@
 - [x] Add unit and installer regression tests and coverage threshold.
 - [x] Install the generated tarball in an isolated project and validate
   idempotent CLI install/uninstall and native agent discovery.
-- [ ] Resolve why the OpenCode 2.0.24 standalone plugin API reports no active
-  plugin for the installed package; verify the custom tool is exposed.
+- [x] Diagnose and fix plugin loading: register the installed local plugin
+  directory, and expose its namespaced tool through Code Mode. Verify activation
+  and execution in OpenCode 2.0.24 against a local mock provider.
 - [x] Detect and refuse ambiguous projects with both project config locations.
 - [ ] Evaluate support for multi-layer project config only after verifying V2
   array merge and precedence behavior.