feat: Sync Claude settings from Elu-co-jp projects

.claude/commands/branch-cleanup.md

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+# Branch Cleanup Command
+
+Clean up merged and stale branches both locally and remotely.
+
+## Usage
+
+```bash
+/branch-cleanup
+/branch-cleanup --remote
+/branch-cleanup --dry-run
+```
+
+## What It Does
+
+This command helps maintain a clean repository by identifying and removing:
+
+### Local Branches
+
+- **Merged Branches**: Branches already merged into main/master
+- **Stale Branches**: Branches with no activity for 30+ days
+- **Gone Remote Branches**: Local branches tracking deleted remote branches
+
+### Remote Branches (with --remote)
+
+- **Merged PR Branches**: Branches from merged pull requests
+- **Stale Remote Branches**: No activity for 30+ days
+- **Abandoned Branches**: No commits, PRs, or activity
+
+### Protected Branches
+
+Never deletes:
+
+- main, master, develop
+- Current branch
+- Branches with unmerged changes
+- Branches specified in protection list
+
+## Example Output
+
+```
+🧹 Branch Cleanup
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+📍 Current branch: feat/add-commands
+🔒 Protected: main, master, develop
+
+📊 Analysis
+  • Total local branches: 15
+  • Merged branches: 8
+  • Stale branches (30+ days): 3
+  • Up-to-date branches: 4
+
+🗑️  Branches to delete (11):
+
+Merged (8):
+  ✓ feat/227-commitlint (merged 2 days ago)
+  ✓ feat/226-common-utils (merged 2 days ago)
+  ✓ feat/225-docker-in-docker (merged 2 days ago)
+  ... and 5 more
+
+Stale (3):
+  ⚠ experiment/new-feature (90 days old)
+  ⚠ fix/old-bug (45 days old)
+  ⚠ refactor/unused (60 days old)
+
+Delete these branches? [y/N]: y
+
+Deleting branches...
+  ✓ Deleted feat/227-commitlint
+  ✓ Deleted feat/226-common-utils
+  ✓ Deleted feat/225-docker-in-docker
+  ✓ Deleted 8 more branches
+
+✨ Cleanup complete! Removed 11 branches.
+```
+
+## Options
+
+```bash
+# Preview without deleting (recommended first run)
+/branch-cleanup --dry-run
+
+# Include remote branches
+/branch-cleanup --remote
+
+# Auto-confirm deletion (for CI)
+/branch-cleanup --yes
+
+# Custom staleness threshold (default: 30 days)
+/branch-cleanup --stale-days 60
+
+# Only merged branches
+/branch-cleanup --merged-only
+```
+
+## Safety Features
+
+- **Dry Run**: Preview before deletion
+- **Interactive Confirmation**: Requires user approval
+- **Protection List**: Never deletes protected branches
+- **Unmerged Detection**: Warns about unmerged changes
+- **Current Branch**: Never deletes current branch
+
+## CI Integration
+
+```yaml
+# .github/workflows/branch-cleanup.yml
+- name: Cleanup Merged Branches
+  run: |
+    bash script/branch-cleanup.sh --merged-only --yes
+```
+
+## Staleness Criteria
+
+| Age    | Status     | Action |
+| ------ | ---------- | ------ |
+| < 30d  | Active     | Keep   |
+| 30-60d | Stale      | Warn   |
+| 60-90d | Very Stale | Delete |
+| > 90d  | Abandoned  | Delete |
+
+## Benefits
+
+- 🧹 **Clean Repository**: Remove clutter
+- ⚡ **Faster Operations**: Fewer branches to manage
+- 👀 **Better Visibility**: Focus on active work
+- 💾 **Disk Space**: Free up local storage
+- 🔄 **Best Practice**: Regular maintenance habit
+
+## Implementation
+
+This command is implemented in `script/branch-cleanup.sh`.
+
+## Requirements
+
+- Git repository
+- GitHub CLI (`gh`) for remote branch operations (optional)
+- Proper permissions for remote deletions