Allow excluding specific runtime queues

[reneklacan]

Summary

• add a repeatable RuntimeBuilder::except_queue::<Q>() denylist
• skip excluded queue coordinators and cron scheduling
• reject excluded queues that were not registered
• support dynamic parent queue exclusions and document the API

When combined with only_queue, the allowlist selects queues first and the denylist removes excluded matches.

Verification

• cargo fmt --all -- --check
• cargo clippy --all-features --workspace
• cargo test -p oxana runtime::tests
• cargo test -p oxana --test integration --no-run

The Redis-backed integration test was compiled but not executed locally because REDIS_URL is not configured in this environment.

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Note

Low Risk
Additive runtime configuration with validation and tests; behavior for callers not using except_queue is unchanged aside from the static-queue allowlist check fix in runs_static_queue.

Overview
Adds RuntimeBuilder::except_queue::<Q>() so workers can run all registered queues except named ones, mirroring the existing only_queue allowlist.

Runtime settings gain a queue_denylist; runs_queue and runs_static_queue now require a queue to pass the allowlist (if any) and not appear on the denylist. Excluding a dynamic parent queue skips its subqueues; existing launcher checks skip coordinators and cron scheduling for excluded queues. run fails fast with a config error if an excluded queue was never registered.

README documents the API and behavior alongside only_queue. Unit and Redis integration tests cover denylist building, dynamic exclusions, validation, and end-to-end job processing.

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