YeonGyu-Kim
2428a46e6d
refactor(features/background-agent): remove dead code submodules
Delete 15 unused files in background-agent module:
- background-task-completer.ts
- format-duration.ts
- message-dir.ts
- parent-session-context-resolver.ts
- parent-session-notifier.ts (and its test file)
- result-handler-context.ts
- result-handler.ts
- session-output-validator.ts
- session-task-cleanup.ts
- session-todo-checker.ts
- spawner/background-session-creator.ts
- spawner/concurrency-key-from-launch-input.ts
- spawner/spawner-context.ts
- spawner/tmux-callback-invoker.ts
Update index.ts barrel and manager.ts/spawner.ts imports
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>