feat: Add syndarix-agents Claude Code plugin

Add specialized AI agent definitions for Claude Code integration:
- Architect agent for system design
- Backend/Frontend engineers for implementation
- DevOps engineer for infrastructure
- Test engineer for QA
- UI designer for design work
- Code reviewer for code review

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

syndarix-agents/CHANGELOG.md

@@ -0,0 +1,32 @@
+# Changelog
+
+All notable changes to the Syndarix Agents plugin will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2025-12-30
+
+### Added
+
+- **backend-engineer** - Senior Backend Engineer specializing in Python/FastAPI, databases, and API design. Includes async patterns, custom exception handling, and 5-layer architecture standards.
+
+- **frontend-engineer** - Senior Frontend Engineer for React/Next.js/TypeScript. Enforces strict TypeScript, proper auth patterns (useAuth over useAuthStore), and WCAG AA compliance.
+
+- **test-engineer** - Senior QA/Test Engineer for TDD and comprehensive testing. Covers pytest async patterns, Playwright E2E, and >90% coverage targets.
+
+- **code-reviewer** - Senior Code Reviewer performing 7-dimension reviews: bug hunting, security, linting, typing, performance, architecture, and test coverage.
+
+- **devops-engineer** - Senior DevOps Engineer for Docker, CI/CD, Celery, and infrastructure. Includes health checks, monitoring, and security hardening standards.
+
+- **ui-designer** - UI/UX Designer creating interactive React prototypes in `frontend/prototypes/`. Follows design system for production, with approval workflow.
+
+- **architect** - Solutions Architect for ADRs, technology evaluation, and system design. Includes ADR template and architecture principles.
+
+### Features
+
+- All agents have project coding standards baked in
+- Issue-driven development workflow enforced
+- Feature branch naming conventions
+- Multi-agent code review process
+- QA gates before main branch merge