v2.12.0 — RAM-ACK write-back PUTs
Adds opt-in RAM-ACK semantics for write-back cache PUTs: acknowledge once a flush-pinned RAM copy is visible, apply configurable dirty-byte watermark backpressure, preserve disk/direct defaults, and expose dirty/ACK/post-ACK-failure metrics. Connector package versions are synchronized to 2.12.0. CI run 31408515097 passed all jobs. Portable artifact sha256: 6a2960c63ba6939710acf7b7c2451839a1d9349bd667836adefb8c59eadd9583.