add backend matrix testing reminder + CI integration tests
- CLAUDE.md: add "before pushing new features" section requiring
full backend matrix tests (sqlite/postgres + memory/redis)
- CI: add sqlite + memory broker integration tests
- CI: add curl/bash dependencies for test scripts
full matrix (postgres/redis) requires docker services - run manually
or enhance CI when tangled supports service containers
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>