Zero-Copy Content Distribution With Signed Manifests

Pattern\n\nThe feed returns a manifest of item hashes and canonical URLs. Partners fetch only what changed.\n\n## Benefit\n\nBandwidth drops 80%+ on high-frequency tiers and integrity verification becomes trivial: compare the SHA-256.\n\n## Caveat\n\nManifests require partners to honor cache semantics. Tier 6 consumers rarely do.