{
  "issueNumber": 266,
  "branchName": "fix/266-worktree-branch-guard",
  "generatedAt": "2026-04-03T12:00:00Z",
  "stories": [
    {
      "id": "S1",
      "title": "Add branch guard in createWorktree() — detect current branch, auto-switch to master if on target branch, throw on checkout failure",
      "priority": 1,
      "dependsOn": [],
      "acceptanceCriteria": [
        "Before stale-branch cleanup, git rev-parse --abbrev-ref HEAD is called to check current branch",
        "If current branch matches target, git checkout master is executed",
        "If git checkout master fails, a descriptive error is thrown (not swallowed)",
        "Detached HEAD state is treated as not on target branch — no checkout attempted"
      ],
      "passes": false,
      "completedAt": null
    },
    {
      "id": "S2",
      "title": "Add unit tests for branch guard scenarios",
      "priority": 2,
      "dependsOn": [
        "S1"
      ],
      "acceptanceCriteria": [
        "Test: main repo on target branch → auto-switch to master → worktree creation succeeds",
        "Test: main repo on target branch → git checkout master fails → typed error thrown",
        "Test: git branch -D failure is handled gracefully (existing behavior preserved)",
        "All existing tests continue to pass",
        "npm run lint passes with zero warnings"
      ],
      "passes": false,
      "completedAt": null
    }
  ]
}