chore: initial backup of Claude Code configuration

Includes: CLAUDE.md, settings.json, agents, commands, rules, skills,
hooks, contexts, evals, get-shit-done, plugin configs (installed list
and marketplace sources). Excludes credentials, runtime caches,
telemetry, session data, and plugin binary cache.

contexts/dev.md

@@ -0,0 +1,26 @@
+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