[matrixarkai]

Summary

• negotiate bounded conditional-write frame limits with chunk servers using canonical binary protobuf
• pack up to 32 small writes into one standalone star frame while retaining the eight-write consensus bound
• keep eight-write framing when any member is older or advertises a lower bound
• account for protobuf envelope bytes while preserving four 1 MiB writes per established frame

Validation

• cargo test --locked -j1 --lib: 626 passed, 0 failed, 28 ignored
• cargo check --locked -j1 --all-targets --all-features: passed
• release replica-state integration suite: 16 passed, 0 failed, 3 ignored
• mixed-version and stalled-member tests passed across three local TCP replicas in WSL
• controlled 5 ms reply-delay run for 32 writes and three replicas: mutation frames fell from 12 to 3; p50 fell from 27.128 ms to 10.826 ms
• the existing 16 x 1 MiB bounded-frame integration test remains green