fix: prevent plugin crash by removing non-function exports from barrel files

BREAKING: OpenCode plugin loader calls all exports as functions.
Exporting non-function values (schemas, constants, types) causes TypeError.

Changes:
- Remove OhMyOpenCodeConfigSchema export from root index.ts
- Replace 'export *' with explicit function exports in hooks/index.ts
- Remove 'export *' from comment-checker/index.ts

src/hooks/comment-checker/index.ts

@@ -94,8 +94,4 @@ export function createCommentCheckerHooks() {
   }
 }
 
-export * from "./types"
-export * from "./constants"
-export * from "./detector"
-export * from "./filters"
-export * from "./output"
+