feat: add comprehensive development and security tools

.claude/commands/README.md

@@ -35,6 +35,105 @@ This directory contains pre-configured commands that provide automated workflows
 /similarity-analysis path=src threshold=0.9
 ```
 
+#### `code-complexity-check.md`
+
+**Purpose**: Analyze code complexity and identify refactoring candidates
+**Features**:
+
+- Cyclomatic complexity analysis
+- Function length and nesting depth detection
+- Complexity thresholds (low/medium/high/critical)
+- Refactoring recommendations
+- CI integration with strict mode
+
+**Usage**:
+
+```
+/code-complexity-check
+/code-complexity-check --threshold 15
+/code-complexity-check --strict
+```
+
+### Quality & Testing
+
+#### `pre-pr-checklist.md`
+
+**Purpose**: Automate comprehensive checks before creating a pull request
+**Features**:
+
+- Sequential quality checks (lint, format, test, etc.)
+- PR size estimation and labeling
+- Linked issues verification
+- Branch status validation
+- Merge conflict detection
+
+**Usage**:
+
+```
+/pre-pr-checklist
+/pre-pr-checklist --skip-tests
+/pre-pr-checklist --verbose
+```
+
+#### `test-coverage-trend.md`
+
+**Purpose**: Track and visualize test coverage trends over time
+**Features**:
+
+- Historical coverage tracking
+- Trend analysis with ASCII graphs
+- Threshold alerts (70% coverage)
+- Per-file coverage breakdown
+- CSV export for external analysis
+
+**Usage**:
+
+```
+/test-coverage-trend
+/test-coverage-trend --days 30
+/test-coverage-trend --graph
+```
+
+### Security
+
+#### `dependency-health-check.md`
+
+**Purpose**: Comprehensive dependency health analysis
+**Features**:
+
+- npm package updates detection
+- Security vulnerability scanning (`npm audit`)
+- Deprecated package identification
+- License compliance checking
+- Health score calculation
+
+**Usage**:
+
+```
+/dependency-health-check
+/dependency-health-check --strict
+/dependency-health-check --json
+```
+
+#### `security-credential-scan.md`
+
+**Purpose**: Scan repository for hardcoded credentials and secrets
+**Features**:
+
+- API key, token, and password detection
+- Private key and certificate scanning
+- .env file validation
+- False positive reduction
+- Auto-fix capabilities
+
+**Usage**:
+
+```
+/security-credential-scan
+/security-credential-scan --fix
+/security-credential-scan --strict
+```
+
 ### Development Environment
 
 #### `setup-husky.md`
@@ -47,15 +146,94 @@ This directory contains pre-configured commands that provide automated workflows
 - Code quality gate enforcement
 - Development workflow integration
 
+#### `container-health.md`
+
+**Purpose**: Verify DevContainer environment health and configuration
+**Features**:
+
+- Tool availability verification
+- Version checking (Node.js, npm, Claude Code)
+- Configuration validation
+- System resource monitoring
+- Auto-fix capabilities
+
+**Usage**:
+
+```
+/container-health
+/container-health --fix
+/container-health --verbose
+```
+
+#### `setup-new-repo.md`
+
+**Purpose**: Bootstrap a new repository with this configuration
+**Features**:
+
+- DevContainer setup
+- Git configuration (commitlint, Husky)
+- GitHub Actions workflows
+- Development tools (ESLint, Prettier, Jest)
+- Documentation templates
+
+**Usage**:
+
+```
+/setup-new-repo /path/to/new/repo
+/setup-new-repo --minimal
+/setup-new-repo --no-devcontainer
+```
+
+### Repository Management
+
+#### `branch-cleanup.md`
+
+**Purpose**: Clean up merged and stale branches
+**Features**:
+
+- Merged branch detection and deletion
+- Stale branch identification (30+ days)
+- Protected branch exclusion
+- Interactive confirmation
+- Remote branch cleanup support
+
+**Usage**:
+
+```
+/branch-cleanup
+/branch-cleanup --dry-run
+/branch-cleanup --remote
+```
+
+#### `changelog-generator.md`
+
+**Purpose**: Generate CHANGELOG from Conventional Commits history
+**Features**:
+
+- Automatic commit grouping by type
+- GitHub commit and PR links
+- Breaking changes highlighting
+- Version detection
+- Keep a Changelog format
+
+**Usage**:
+
+```
+/changelog-generator
+/changelog-generator --since v1.0.0
+/changelog-generator --contributors
+```
+
 #### `setup-team-protection.md`
 
-**Purpose**: Configures GitHub repository protection for team development
+**Purpose**: Setup GitHub repository protection rules for team development
 **Features**:
 
-- Branch protection rules (no direct push, required reviews)
+- Branch protection (no direct push, required reviews)
 - Required status checks (CI passing)
 - Repository settings (squash merge, auto-delete branches)
 - Security features (Dependabot, vulnerability alerts)
+- Configurable reviewer count and enforcement
 
 **Usage**:
 

.claude/commands/changelog-generator.md

@@ -0,0 +1,153 @@
+# Changelog Generator Command
+
+Generate CHANGELOG.md from Conventional Commits history.
+
+## Usage
+
+```bash
+/changelog-generator
+/changelog-generator --since v1.0.0
+/changelog-generator --output CHANGELOG.md
+```
+
+## What It Does
+
+This command generates a structured CHANGELOG from git commit history:
+
+### Commit Grouping
+
+Automatically groups commits by type:
+
+- **Features** (feat): New features and enhancements
+- **Bug Fixes** (fix): Bug fixes and patches
+- **Performance** (perf): Performance improvements
+- **Breaking Changes**: BREAKING CHANGE notes
+- **Documentation** (docs): Documentation updates
+- **Other**: ci, chore, refactor, test, style, build
+
+### Version Detection
+
+- **Automatic Versioning**: Detects latest tag
+- **Custom Range**: Specify start tag with `--since`
+- **Unreleased Changes**: Shows commits since last tag
+
+### Changelog Format
+
+- **Grouped by Type**: Organized sections
+- **Commit Links**: GitHub commit URLs
+- **PR References**: Links to pull requests
+- **Breaking Changes**: Highlighted separately
+- **Contributors**: Optional contributor list
+
+## Example Output
+
+```markdown
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+### Features
+
+- Add dependency health check command ([#238](https://github.com/user/repo/pull/238))
+- Add pre-PR checklist automation ([a1b2c3d](https://github.com/user/repo/commit/a1b2c3d))
+- Branch cleanup utility ([4e5f6g7](https://github.com/user/repo/commit/4e5f6g7))
+
+### Bug Fixes
+
+- Fix coverage reporting in CI ([8h9i0j1](https://github.com/user/repo/commit/8h9i0j1))
+- Resolve shellcheck warnings ([2k3l4m5](https://github.com/user/repo/commit/2k3l4m5))
+
+### Documentation
+
+- Update README with new commands ([#239](https://github.com/user/repo/pull/239))
+
+## [1.0.0] - 2025-12-30
+
+### Features
+
+- Initial release with comprehensive CI/CD
+- DevContainer configuration
+- Claude Code integration
+
+### BREAKING CHANGES
+
+- Minimum Node.js version is now 22+
+```
+
+## Options
+
+```bash
+# Generate since specific tag
+/changelog-generator --since v1.0.0
+
+# Generate for all history
+/changelog-generator --all
+
+# Custom output file
+/changelog-generator --output HISTORY.md
+
+# Include all commit types
+/changelog-generator --include-all
+
+# Add contributors section
+/changelog-generator --contributors
+
+# Preview without writing
+/changelog-generator --dry-run
+```
+
+## Conventional Commit Types
+
+| Type     | Section          | Included by Default |
+| -------- | ---------------- | ------------------- |
+| feat     | Features         | ✅                  |
+| fix      | Bug Fixes        | ✅                  |
+| perf     | Performance      | ✅                  |
+| docs     | Documentation    | ✅                  |
+| BREAKING | BREAKING CHANGES | ✅                  |
+| refactor | Refactoring      | ❌                  |
+| test     | Tests            | ❌                  |
+| ci       | CI/CD            | ❌                  |
+| chore    | Chores           | ❌                  |
+| style    | Style            | ❌                  |
+| build    | Build            | ❌                  |
+
+## CI Integration
+
+```yaml
+# .github/workflows/release.yml
+- name: Generate Changelog
+  run: |
+    bash script/changelog-generator.sh --since ${{ github.event.release.tag_name }}
+    git add CHANGELOG.md
+    git commit -m "docs: update changelog for ${{ github.event.release.tag_name }}"
+```
+
+## Format
+
+The generated changelog follows [Keep a Changelog](https://keepachangelog.com/) format:
+
+- **Readable**: Human-friendly format
+- **Parseable**: Machine-readable structure
+- **Consistent**: Follows Conventional Commits
+- **Linkable**: GitHub URLs for commits and PRs
+
+## Benefits
+
+- 📝 **Automated**: No manual changelog maintenance
+- ✅ **Accurate**: Based on actual commits
+- 🔗 **Linked**: Direct links to commits and PRs
+- 📊 **Organized**: Grouped by semantic meaning
+- ⚡ **Fast**: Quick generation from git log
+
+## Implementation
+
+This command is implemented in `script/changelog-generator.sh`.
+
+## Requirements
+
+- Git repository with conventional commits
+- GitHub repository (for PR links)
+- Git tags for version markers