Move git utilities from scripts/modules/utils/git-utils.js to packages/tm-core/src/utils/git-utils.ts for better type safety and reusability.
## Changes
**New File**: `packages/tm-core/src/utils/git-utils.ts`
- Converted from JavaScript to TypeScript with full type annotations
- Added `GitHubRepoInfo` interface for type safety
- Includes all essential git functions needed for Phase 1:
- `isGitRepository`, `isGitRepositorySync`
- `getCurrentBranch`, `getCurrentBranchSync`
- `getLocalBranches`, `getRemoteBranches`
- `isGhCliAvailable`, `getGitHubRepoInfo`
- `getDefaultBranch`, `isOnDefaultBranch`
- `sanitizeBranchNameForTag`, `isValidBranchForTag`
**Updated Files**:
- `preflight-checker.service.ts`: Now imports from local git-utils
- `packages/tm-core/src/utils/index.ts`: Exports git utilities
## Rationale
Phase 1 will need git operations for:
- Creating feature branches (WorkflowOrchestrator)
- Checking git status before execution
- Validating clean working tree
- Branch naming validation
Having these utilities in tm-core provides:
- Type safety (no more `require()` hacks)
- Better testability
- Cleaner imports
- Reusability across services
## Verification
✅ All tests pass (1298 passed, 121 test suites)
✅ Typecheck passes (5/5 successful)
✅ Build successful
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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