chore(release): prepare v1.0.0 (#12)

- Add CHANGELOG.md
- Version 1.0.0 with AI-enhanced development workflow

Co-authored-by: nullhack <nullhack@noreply.github.com>

Author: nullhack

CHANGELOG.md

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+# Changelog
+
+All notable changes to this template will be documented in this file.
+
+## [v1.0.0] - 2026-03-12
+
+### Added
+- **AI-Enhanced Development Workflow** - Complete OpenCode integration for AI-powered development
+- **Developer Agent** - Main development agent with 7-phase TDD/BDD workflow
+- **Architect Agent** - Design review agent for SOLID principles and object calisthenics compliance
+- **Repository Manager Agent** - Git operations, PRs, and themed releases management
+- **Development Skills** - feature-definition, prototype-script, tdd-bdd, signature-design, implementation, code-quality
+- **Repository Skills** - git-release (hybrid calver versioning with themed releases), pr-management
+- **Meta Skills** - create-skill, create-agent for extending OpenCode
+- **Template Management** - template-manager agent, template-test, template-release skills
+- **Comprehensive CI Workflow** - Template validation, generated project tests, Docker builds
+- **Validation Scripts** - cookiecutter.json, pyproject.toml, YAML frontmatter validation
+
+### Changed
+- Updated README.md with modern AI-focused branding
+- Updated generated project README template with AI development workflow
+
+### Features
+- **7-Phase Development Cycle**: Feature Definition → Prototype → TDD → Signature Design → Architecture Review → Implementation → Quality Assurance
+- **SOLID Principles Enforcement** - Single responsibility, dependency inversion, interface segregation
+- **Object Calisthenics** - No primitives, small classes, behavior-rich objects
+- **Hybrid Calver Versioning**: v1.2.20260302r1 format with themed releases
+- **Themed Release Names**: "Swift Cheetah", "Vigilant Owl", "Creative Fox" based on PR sentiment
+- **Property-Based Testing**: Hypothesis integration for robust test coverage
+
+### Migration Notes
+- This is the first semantic version release
+- No breaking changes to cookiecutter.json structure
+- Generated projects now include OpenCode agents and skills
+- Existing projects can regenerate to get new features