Fix ui-parser exports: make self-contained and export parseStdoutLine directly

- ui-parser.ts: inline all logic, zero external imports (matches Paperclip
  adapter plugin UI parser contract)
- Export parseStdoutLine as named export from index.ts (like claude_k8s
  exports printClaudeStreamEvent directly)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/index.ts

@@ -63,3 +63,4 @@ Notes:
 `;
 
 export { createServerAdapter } from "./server/index.js";
+export { parseStdoutLine } from "./ui-parser.js";