- Add hydrate_and_cache_bytes to services/cloud_cache.py (Plan 06 cache lifecycle)
- Cache-hit path: pin existing entry, read from MinIO, release pin in finally
- Cache-miss path: fetch from provider, store in MinIO, create/reactivate entry, pin during response, release pin in finally
- CacheQuotaExceeded and MinIO failures are non-fatal (bytes returned from provider path)
- evict_lru_entries run after pin release to stay within user cache limit
- Update preview_cloud_file and download_cloud_file in operations.py to call hydrate_and_cache_bytes
- Version key computed from CloudItem metadata (no provider call required for key resolution)
- Shared _make_minio_cache_wrapper helper eliminates duplicate adapter code
- Falls through to direct provider fetch when no CloudItem row found
- Add _make_minio_cache_wrapper helper to operations.py (DRY, shared by preview and download)
- Add 5 new tests to test_cloud_cache.py: cache-miss fetches provider, cache-hit skips provider, pin released on hit, pin released on miss, user isolation
- Add 3 new security tests to test_cloud_security.py: preview response excludes object_key, download response excludes object_key, foreign-user IDOR via download blocked
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