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OptimizedFileContent::Mmap was constructed nowhere — the documented "Tier 2: memory-mapped I/O (10-100 MB)" path was never wired, so optimized_inner only ever returns Bytes (<10 MB) or Stream (>=10 MB). The variant survived only as an enum case plus two dead match arms in the file and share download handlers. Remove the variant and its arms, and fix the now-misleading retrieval-service tier docs (everything >=10 MB streams via CDC chunk reassembly with the backend read-ahead; there is no mmap tier). Behaviour is unchanged — the deleted arms were unreachable. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JG5yYZ9s868mJwqT2Qz7ez