preserve reserved queue metadata#1305
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Dynamic queue addition registers a producer before starting it. A startup failure can therefore leave the queue name occupied and, for plugin pilots, leave persisted producer state behind even though `QueueBundle.Add` returned an error. Clean up initialized producer state under a bounded timeout when startup fails. Remove successfully cleaned producers from the client registry so the queue name can be retried. If cleanup also fails, retain the producer behind a typed error so `Remove` can retry without losing track of it. Also release partially registered notifier subscriptions and cover both the successful-cleanup and cleanup-retry paths through a pilot-backed client.
Rate and concurrency coordination need readers that can coexist while still excluding queue-wide maintenance. Expose PostgreSQL shared advisory transaction locks through the internal driver interface and both PostgreSQL drivers. SQLite continues to return `ErrNotImplemented`. Extend the cross-driver transaction suite to verify that shared holders coexist and block an exclusive holder until both transactions finish.
Pilot implementations that interpret producer state need the same liveness horizon that River uses to reap unresponsive producers. Keeping a second duration in plugins can make stale producers count toward one limiter while River has already stopped treating them as live. Name River's existing five-minute horizon once and pass it through `PilotInitParams`. Continue using the same value in producer maintenance and verify plugin pilots receive it during client initialization.
Queue metadata needs a namespace for River-managed runtime state without exposing implementation details or allowing ordinary user updates to erase them. Treat top-level `river:*` keys as reserved while preserving the existing public metadata contract. Filter reserved keys from creates, updates, reads, lists, notifications, and producer polling. Preserve them atomically in driver `QueueUpdate` queries. Wrap non-object user metadata under an internal key so arbitrary JSON values continue to round trip while runtime state remains an object alongside them. Exercise the behavior through clients and the shared PostgreSQL and SQLite driver conformance suite.
Queue cleanup currently deletes rows solely from `updated_at`. A queue can therefore age past the retention horizon while reserved runtime state still contains unexpired debt needed by a plugin. Pass one clock value through each cleanup pass and retain rows whose internal rate-limit rollup has a future expiry. Treat malformed runtime state conservatively so cleanup cannot destroy it. Lock selected rows with `FOR UPDATE SKIP LOCKED` to avoid racing concurrent runtime updates and to let parallel cleaners make progress safely. Cover expired, live, absent, and malformed runtime state across PostgreSQL and SQLite drivers.
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Adds support for reserved internal queue metadata. Queue updates preserve reserved keys, while public queue reads and notifications omit them.
Queue cleanup now locks candidates before deletion and retains rows with unexpired internal state. The driver interface also exposes shared transaction advisory locks, and pilot initialization receives River's existing producer stale-retention period.