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Groundwork for encrypted-object replication (backlog#1783, PR-A of 3): - classify_replication_source_encryption: accept the AES256 marker that every stored SSE-C object carries; the SseC arm was unreachable. - Fail closed on sealed material without an SSE marker (MinIO-written objects) instead of replicating ciphertext as plaintext. - Replace the dead VALID_SSE_REPLICATION_HEADERS table with a transport map keyed by the metadata keys the SSE writer actually persists, shared via the new rustfs_utils::http::object_encryption_keys module. - Structurally strip all encryption metadata from outbound replication (x-rustfs-encryption-* envelopes previously passed the filters). - Skip decrypt_checksums for encrypted objects at the boundary so its is_multipart=false (a response-path contract) cannot misroute encrypted multipart objects once managed replication opens. - Redact X-Rustfs-Replication-* SSE transport values in FileInfo Debug. A reconciliation test pins that every key encryption_material_to_metadata produces is either transport-mapped or stripped. All four SSE replication e2e contracts still assert FAILED unchanged.