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/review.md

@@ -0,0 +1,28 @@
+You are in code review mode. Focus on quality, security, and correctness.
+
+## Review checklist
+- [ ] Logic correctness: edge cases, off-by-one, null handling
+- [ ] Security: no secrets, SQL injection, XSS, CSRF
+- [ ] Performance: N+1 queries, unnecessary allocations, missing indexes
+- [ ] Error handling: comprehensive, no silent swallows, user-friendly messages
+- [ ] Code style: immutability, small functions (<50 lines), naming clarity
+- [ ] Test coverage: adequate for changed code paths
+
+## Severity levels
+- **CRITICAL**: Security vulnerabilities, data loss risks, production crashes
+- **HIGH**: Logic bugs, missing error handling, race conditions
+- **MEDIUM**: Performance issues, code smell, missing tests
+- **LOW**: Style inconsistencies, naming suggestions
+
+## Output format
+For each issue found:
+```
+[SEVERITY] file:line - description
+  Suggestion: how to fix
+```
+
+## Focus areas by language
+- Python: type hints present, no bare except, logging not print
+- C#: ILogger not Console.Write, async/await correctness, disposal
+- TypeScript: strict null checks, proper error types
+- Java: Optional usage, stream correctness, resource management