fix(migration): remove auto model-to-category conversion (#764)

* chore(deps): upgrade @opencode-ai/plugin and sdk to 1.1.19

* docs(prometheus): add Question tool usage reminder

* fix(migration): remove auto model-to-category conversion

- Remove migrateAgentConfigToCategory call from migrateConfigFile
- User's explicit model/category settings are now preserved as-is
- No more unwanted deletion of agent configs (e.g., multimodal-looker)
- Add BUILTIN_AGENT_NAMES constant for future reference
- Update tests to reflect new behavior

* ci(sisyphus): add mandatory 'new branch + PR' todos for implementation tasks

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Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>

package.json

@@ -52,8 +52,8 @@
     "@code-yeongyu/comment-checker": "^0.6.1",
     "@modelcontextprotocol/sdk": "^1.25.1",
     "@openauthjs/openauth": "^0.4.3",
-    "@opencode-ai/plugin": "^1.1.1",
-    "@opencode-ai/sdk": "^1.1.1",
+    "@opencode-ai/plugin": "^1.1.19",
+    "@opencode-ai/sdk": "^1.1.19",
     "commander": "^14.0.2",
     "hono": "^4.10.4",
     "js-yaml": "^4.1.1",