Pin @opencode-ai/plugin version with comment explaining npm plugin loading

- Changed @opencode-ai/plugin from devDependencies to dependencies
- Pinned version to ~1.3.13 (patch updates only)
- Added inline comment explaining why: opencode downloads npm plugins
  without devDependencies, causing module resolution failures
- Kept peerDependency for documentation purposes

Author: hakanai3d

package.json

@@ -70,7 +70,7 @@
     ]
   },
   "dependencies": {
-    "@opencode-ai/plugin": "^1.3.13",
+    "@opencode-ai/plugin": "~1.3.13", // Required for npm plugin loading (opencode downloads plugins without devDependencies)
     "chokidar": "^5.0.0",
     "ignore": "^7.0.5",
     "p-queue": "^9.1.1",
@@ -92,7 +92,7 @@
   },
   "peerDependencies": {
     "@modelcontextprotocol/sdk": "^1.29.0",
-    "@opencode-ai/plugin": "^1.0.0",
+    "@opencode-ai/plugin": "^1.0.0", // Bundled in dependencies for npm plugin loading
     "zod": "^3.0.0"
   },
   "peerDependenciesMeta": {