Walkability#3
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Add a durable, redb-backed pin queue and background drainer (W.9.6) to provide crash-safe, retriable pin/unpin dispatch. New modules pin_queue and pin_drainer implement enqueueing of PinRequest records, bounded-concurrency dispatch, exponential backoff, dead-letter graduation, and a LivePinDispatcher that routes MasterCluster and UserExternal pins (including durable unpin for user-external). Handlers (object, multipart, admin) now enqueue pins to the queue (with a fire-and-forget fallback when the queue is unset for tests/dev), and object.rs gains a helper to route user-external pins via the queue. Gateway config gets a pin_queue_path option (default /var/lib/fula-gateway/pin_queue.redb). Cargo.toml updated to add redb and postcard workspace deps. Tests and unit coverage for the drainer/dispatcher behavior were added/updated.
Flip walkable-v8 writer default on and add supporting changes: forward storage CID hints in EncryptedClient reads to trigger gateway-race cold-fetches; add end-to-end walkable-v8 fresh-bucket upload + walk tests (upload, online warm-cache, cold-cache offline phases); expose and implement CountingBlobBackend and CountSnapshot (cfg-gated) to instrument PUT/GET/get_with_cid_hint RPC counts and validate v7/v8 parity; update fula-flutter types/docs and changelog to reflect the default-on change; adjust registry resolver gateway ordering comment; add PowerShell helper scripts for walkable-v8 testing. These changes enable the cold-start resolver path, provide test coverage for rollout behavior, and add tooling to assert RPC parity between v7 and v8 writers.
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