Critical fixes:
- Align create_branch schema description with runtime default (true)
- Add ^ and . to branch name start-of-name validation regex
Major fixes:
- Move dynamic import('node:fs/promises') to static top-level import
- Add integration tests for git_worktree_create execute flow
- Use WorktreeError + formatValidationError for current-branch error
Minor fixes:
- Replace fragile .toContain() assertions with specific strings
- Add 14 new tests for branch name start/end and dangerous char validation
- Document resolveWorktreeTarget as dead code until switch/remove tools ship
Suggestions implemented:
- Reject leading dot in branch names (git compliance)
- Extract formatSuccessResponse() helper for consistency
- Add pi-worktree-create.ts with pure validation/command-building functions
- validateCreateWorktreeInput: checks path and branch name validity
- validatePathDoesNotExist: refuses if target path exists (injectable for testing)
- isCurrentBranch: prevents creating worktree on current branch
- buildWorktreeAddCommand: builds correct git command with -b flag support
- Full error messages match issue acceptance criteria exactly
- 17 new tests covering all validation paths and edge cases
