cks-runtime v1.55.0 – handle version hash mismatch and cap outbox retries

Fixed

• Version reconstruction hash mismatch – OutboxEmbeddingWorker now retries a failed get_version_state once against a freshly reloaded session when the failure is a state-hash mismatch. This clears a transient snapshot-consistency race caused by concurrent agent writes, without masking genuine corruption (a persistent mismatch still fails).

Added

• Outbox task retry cap – after max_retries failed attempts (default 5), a task is dead-lettered instead of retrying forever with exponential backoff. This prevents permanently failing tasks (e.g. corrupted patch chains) from looping indefinitely.
• max_retries parameter on OutboxEmbeddingWorker for configurable retry limits.

Tests

• Added regression tests for hash-mismatch recovery, persistent mismatch, dead-letter after max retries, and non-hash-mismatch errors bypassing the reload retry.