docs: add CLAUDE.md pointing to key project documentation

Links to PROJECT-MEMORY.md and DECISIONS.md for development rules
and architectural decisions, plus quick commands and doc index.

CLAUDE.md

@@ -0,0 +1,30 @@
+# CV Project Instructions
+
+## Required Reading
+
+1. **[PROJECT-MEMORY.md](./PROJECT-MEMORY.md)** - Development rules, critical bugs, patterns
+2. **[doc/DECISIONS.md](./doc/DECISIONS.md)** - Architectural Decision Records (ADRs)
+
+## Quick Commands
+
+```bash
+# Run all frontend tests (Playwright)
+bun tests/run-all.mjs
+
+# Run Go tests with coverage
+go test -cover ./internal/...
+
+# Start dev server
+go run .
+```
+
+## Tech Stack
+
+- **Backend**: Go 1.21+ with standard library
+- **Frontend**: HTMX + Hyperscript + Vanilla JS
+- **Testing**: Playwright (frontend), Go test (backend)
+
+## Documentation Index
+
+- [doc/00-GO-DOCUMENTATION-INDEX.md](./doc/00-GO-DOCUMENTATION-INDEX.md) - Go system docs
+- [doc/01-ARCHITECTURE.md](./doc/01-ARCHITECTURE.md) - System architecture