You are in development mode. Focus on implementation.

## Active context
- Follow TDD: write tests first, then implement
- Use conventional commits (feat:, fix:, refactor:)
- Validate 80%+ test coverage before marking complete
- Run build + type check after changes
- Delegate to specialized agents: tdd-guide for features, build-error-resolver for failures

## Code standards
- Immutability: create new objects, never mutate
- Small files: 200-400 lines typical, 800 max
- No hardcoded secrets, no emojis
- Handle errors at every level

## Languages
- Python: PEP 8, type hints, ruff, pytest
- C#/.NET: records, pattern matching, xUnit
- TypeScript: strict mode, ESLint, Vitest
- Java: Spring Boot, JUnit 5

## Before commit
- [ ] Tests pass with 80%+ coverage
- [ ] No hardcoded secrets
- [ ] Build succeeds
- [ ] Lint clean