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90a342dc33
Implemented SHA256-based Content-Addressed Storage to eliminate cache collisions and enable automatic deduplication. Key Features: - Zero collision risk: SHA256 namespace guarantees uniqueness - Automatic deduplication: same content = same filename - Tampering protection: changing content changes SHA, breaks lookup - Two-level directory structure (ab/cd/abcdef...) for filesystem optimization Changes: - Added ContentAddressedCache adapter in adapters/cache_cas.py - Updated CLI and SDK to use CAS instead of FsCacheAdapter - Updated all tests to use ContentAddressedCache - Documented CAS architecture in CLAUDE.md and SECURITY_FIX_ROADMAP.md Security Benefits: - Eliminates cross-endpoint collision vulnerabilities - Self-describing cache (filename IS the checksum) - Natural cache validation without external metadata All quality checks passing: - 99 tests passing (0 failures) - Type checking: 0 errors (mypy) - Linting: All checks passed (ruff) Completed Phase 2 of SECURITY_FIX_ROADMAP.md