feat: support disable skills by name. (#15378)

Support disabling skills by name, primarily for plugin skills. We can’t
use the path, since plugin skill paths may change across versions.

codex-rs/app-server/README.md

@@ -164,10 +164,10 @@ Example with notification opt-out:
 - `collaborationMode/list` — list available collaboration mode presets (experimental, no pagination). This response omits built-in developer instructions; clients should either pass `settings.developer_instructions: null` when setting a mode to use Codex's built-in instructions, or provide their own instructions explicitly.
 - `skills/list` — list skills for one or more `cwd` values (optional `forceReload`).
 - `plugin/list` — list discovered plugin marketplaces and plugin state, including effective marketplace install/auth policy metadata and best-effort `featuredPluginIds` for the official curated marketplace. `interface.category` uses the marketplace category when present; otherwise it falls back to the plugin manifest category. Pass `forceRemoteSync: true` to refresh curated plugin state before listing (**under development; do not call from production clients yet**).
-- `plugin/read` — read one plugin by `marketplacePath` plus `pluginName`, returning marketplace info, a list-style `summary`, manifest descriptions/interface metadata, and bundled skills/apps/MCP server names. Plugin app summaries also include `needsAuth` when the server can determine connector accessibility (**under development; do not call from production clients yet**).
+- `plugin/read` — read one plugin by `marketplacePath` plus `pluginName`, returning marketplace info, a list-style `summary`, manifest descriptions/interface metadata, and bundled skills/apps/MCP server names. Returned plugin skills include their current `enabled` state after local config filtering. Plugin app summaries also include `needsAuth` when the server can determine connector accessibility (**under development; do not call from production clients yet**).
 - `skills/changed` — notification emitted when watched local skill files change.
 - `app/list` — list available apps.
-- `skills/config/write` — write user-level skill config by path.
+- `skills/config/write` — write user-level skill config by name or absolute path.
 - `plugin/install` — install a plugin from a discovered marketplace entry, rejecting marketplace entries marked unavailable for install, install MCPs if any, and return the effective plugin auth policy plus any apps that still need auth (**under development; do not call from production clients yet**).
 - `plugin/uninstall` — uninstall a plugin by id by removing its cached files and clearing its user-level config entry (**under development; do not call from production clients yet**).
 - `mcpServer/oauth/login` — start an OAuth login for a configured MCP server; returns an `authorization_url` and later emits `mcpServer/oauthLogin/completed` once the browser flow finishes.
@@ -1145,14 +1145,29 @@ The server also emits `skills/changed` notifications when watched local skill fi
 }
 ```
 
-To enable or disable a skill by path:
+To enable or disable a skill by absolute path:
 
 ```json
 {
   "method": "skills/config/write",
   "id": 26,
   "params": {
-    "path": "/Users/me/.codex/skills/skill-creator/SKILL.md",
+    "path": "/Users/alice/.codex/skills/skill-creator/SKILL.md",
+    "name": null,
+    "enabled": false
+  }
+}
+```
+
+To enable or disable a skill by name:
+
+```json
+{
+  "method": "skills/config/write",
+  "id": 27,
+  "params": {
+    "path": null,
+    "name": "github:yeet",
     "enabled": false
   }
 }