feat(shared/git-worktree, features): add git diff stats utility and infrastructure improvements

- Add collect-git-diff-stats utility for git worktree operations
- Add comprehensive test coverage for git diff stats collection
- Enhance claude-tasks storage module
- Improve tmux subagent manager initialization
- Support better git-based task tracking and analysis

🤖 Generated with assistance of OhMyOpenCode

src/features/claude-tasks/storage.ts

@@ -26,6 +26,9 @@ export function resolveTaskListId(config: Partial<OhMyOpenCodeConfig> = {}): str
   const envId = process.env.ULTRAWORK_TASK_LIST_ID?.trim()
   if (envId) return sanitizePathSegment(envId)
 
+  const claudeEnvId = process.env.CLAUDE_CODE_TASK_LIST_ID?.trim()
+  if (claudeEnvId) return sanitizePathSegment(claudeEnvId)
+
   const configId = config.sisyphus?.tasks?.task_list_id?.trim()
   if (configId) return sanitizePathSegment(configId)