fix: restore .worktrees/ entry in .gitignore and add backend/tests/__init__.py
- Restored .worktrees/ line that was lost when .gitignore was overwritten in commit 1736dd0
- Added backend/tests/__init__.py as a package marker (was untracked on disk)
- Test suite verified: backend tests pass (1/1)
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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