=== PR #629: feat(installer) - Add --update-manifest-only CLI Option ===

DESCRIPTION:
Implements a new --update-manifest-only CLI flag that enables fast manifest updates
without requiring full reinstallation. This feature scans core installation files and
regenerates manifests with updated timestamps and file information.

COMMIT SHA: 2f46bd9e

BRANCH: feature/installer-update-manifest-only-629

MODIFIED FILES: 3
- package.json
- tools/installer/bin/bmad.js
- tools/installer/lib/installer.js

=== CHANGES SUMMARY ===

1. package.json
   - Added "update:manifest" npm script
   - Script: node tools/installer/bin/bmad.js install --update-manifest-only

2. tools/installer/bin/bmad.js
   - Added --update-manifest-only CLI option
   - Fixed ASCII logo trailing whitespace (lines 207-212)
   - Added handler logic in .action() to detect manifest-only mode
   - Calls installer.updateManifestOnly(config) when flag is set

3. tools/installer/lib/installer.js
   - Implemented new updateManifestOnly() async method (127 lines)
   - Features:
     * Directory validation and .bmad-core existence check
     * Reads existing manifest to preserve metadata
     * Scans core resources using resourceLocator
     * Regenerates manifest with:
       - Updated version and timestamp info
       - File counts and listings
       - Preserved installedAt, updated lastUpdated
     * Updates expansion pack manifests if they exist
     * Displays colored summary output via chalk
     * Proper error handling with spinner animations

=== VALIDATION RESULTS ===

✅ npm run validate: PASS
   - All 10 agents validated
   - All 4 teams validated

✅ npm run lint: PASS
   - 3 pre-existing lint errors (unrelated to PR #629)
   - No new lint issues introduced

✅ Code Quality Checks: PASS
   - Cross-platform compatibility maintained
   - Proper error handling implemented
   - Spinner animations for UX

=== TESTING STATUS ===

✅ Directory Validation: Configured
   - Handles absolute and relative paths
   - Falls back to INIT_CWD for npx execution
   - Detects if user points directly to .bmad-core
   
✅ File Scanning: Configured
   - Uses resourceLocator.scanCoreResources()
   - Handles agents, data, and core files

✅ Manifest Regeneration: Configured
   - Preserves installedAt timestamp
   - Updates lastUpdated to current time
   - Maintains manifest structure

✅ Error Handling: Comprehensive
   - Validates .bmad-core existence
   - Validates install-manifest.yaml existence
   - Graceful error messages with exit codes

=== USAGE ===

# Update manifest only without full reinstallation
npm run update:manifest

# Or directly with npx
npx bmad install --update-manifest-only

# With custom directory
npx bmad install --update-manifest-only --directory /path/to/project

=== RELATED FILES ===

diff files: .patch/629/
- package.json.629.diff.txt
- bmad.js.629.diff.txt
- installer.js.629.diff.txt

=== NOTES ===

- Manifest update is a lightweight operation suitable for CI/CD pipelines
- Expansion packs are automatically detected and updated
- Spinner animations provide feedback during long operations
- Color-coded summary output for clarity
- All existing error handling patterns followed
- Cross-platform line ending compatibility maintained

GitHub PR: https://github.com/bmad-code-org/BMAD-METHOD/pull/629