Agentica v2.0.0

feat: Agentica v2.0.0 — Self-learning AI agent kit

- ReasoningBank: Vector memory for past decisions (cosine similarity)
- Model Router: Auto-selects lite/flash/pro model (~40% token savings)
- MCP Server: 11 tools for VS Code Copilot + Claude Desktop
- 20 Specialist Agents with YAML specs + schema validation
- Memory Tools: memory_store, memory_search, memory_consolidate
- npx agentica init CLI: lite/full/link install modes
- GitHub Actions CI/CD: agent validation + release automation
- VS Code deep integration: mcp.json, settings, launch configs
- Project installer: plug into any existing project in 30 seconds
- Self-learning loop: decisions → patterns → fast path (~60% savings)