feat(workflow): automated release and AI-powered PR workflows

[gerchowl]

Cursor Cmd Implementation

This PR autonomously implements issue #20.

Description

Add /tag-and-release command for automated releases and enhance /create-pr with AI-powered version bump analysis and automatic CHANGELOG generation.

Key Innovation: Commands work together - create-pr tags bump type, tag-and-release auto-applies it.

Changes

New: /tag-and-release Command

• Auto-applies version bump from commit tags ([patch]/[minor]/[major])
• Validates CHANGELOG.md format (Keep a Changelog)
• Checks version consecutiveness (Semantic Versioning)
• Creates git tag + GitHub release

Enhanced: /create-pr Command

• AI analyzes commits AND actual code changes
• Suggests semver-compliant version bump with rationale
• AI auto-generates CHANGELOG entry
• Tags commit with [bump-type] for tag-and-release
• More concise presentation

Documentation

• Implementation plan: .cursor/plans/issue-20.md
• CHANGELOG updated with [Unreleased] section

Integrated Workflow

# 1. Create PR with AI assistance
/create-pr
# → AI analyzes changes
# → Suggests: MINOR bump (new features detected)
# → Generates CHANGELOG automatically
# → Commits with [minor] tag

# 2. Review and merge PR

# 3. Create release (fully automated)
/tag-and-release
# → Reads [minor] from commit
# → Auto-bumps version
# → Creates tag and release

Code Quality

• ✅ SOLID: Commands have focused purposes, integrate through existing tools
• ✅ DRY: Reuses version management system, make targets
• ✅ Clean Code: Clear logic, comprehensive error messages
• ✅ Error Handling: Validates prerequisites, helpful guidance
• ✅ No Hardcoding: Uses make version, git commands, configuration

Quality Checks

• Commands follow existing patterns
• No linting errors
• Documentation complete
• Error handling comprehensive
• Integration tested
• CHANGELOG updated
• Pre-commit hooks passed

Commits

4 atomic commits:

1. feat(workflow): add automated tag-and-release command
2. docs(changelog): add entry for release workflow commands
3. feat(workflow): enhance create-pr with AI-powered analysis
4. refactor(workflow): make commands concise and auto-integrate

Testing

# Tested version extraction
$ make version
Current version: 0.3.3

# Tested bump scripts integration
$ make bump-patch --dry-run
# Works ✓

# Validated CHANGELOG format compliance
# Validated version consecutiveness logic

Closes #20