Optimize subscriber slot delivery#104
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Add per-subscriber slot queues and a drop-detection toggle so unreliable subscribers can avoid scanning slot bitsets on the hot receive path.
Explicitly reset the read message before reusing the publisher buffer in PublishAndReadWithSubscriberQueue so the slot is released as intended.
Keep bitsets authoritative while making per-subscriber queues bounded, reclaimable, ABI-checked, and consistent across C++, Rust, and shadow recovery.
Make queue delivery recover safely through authoritative bitsets across overflow, rejection, churn, and server failover while preserving C++ and Rust parity.
Decouple publisher arena provisioning in bytes from per-subscriber queue capacity and carry the layout through clients, bridges, and recovery.
Avoid retaining rejected reusable messages and keep the Android-only constructor test aligned with the explicit queue arena API.
Preserve version diagnostics before unmapping, clear partial mapping state, and initialize the synthetic memfd CCB used by Android tests.
Concurrent publishers can reserve queue positions out of ordinal order; recover earlier bits and only discard exact generations already delivered.
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Summary
Test plan