Roll up integration into dev

[loning]

Summary:
This rollup fixes a durable-delivery liveness gap where a consumer swap could leave pending or in-flight work bound to a removed consumer even though the queue now has a live subscriber.

Changes:

• Rebinds stale durable deliveries to the current reliable subscriber for the same queue after a consumer swap.
• Prevents “pending, has subscriber” deliveries from remaining silently undispatched.
• Keeps the scope focused on rerouting swapped-consumer deliveries; broader no-subscriber orphan/DLQ policy remains separate.
• Includes coverage for the consumer-swap case surfaced by the observe improvements from observe: distinguish orphan-pending (no subscriber) from stuck-pending durable deliveries so chronic orphans don't mask real stuck deliveries #238.

中文简述：
本次汇总修复 durable delivery 在 consumer 替换后可能卡在旧 consumer 绑定上的问题。现在同一 queue 存在当前 reliable subscriber 时，会把陈旧 delivery 重新绑定并继续分发，避免有订阅者但长期 pending 的静默丢活问题。

Referenced work:

• delivery-routing: a consumer swap orphans in-flight deliveries — pending on a queue that HAS a live subscriber, never dispatched (surfaced by #238) #245: consumer swap orphaned in-flight deliveries on a queue with a live subscriber.
• github-devloop implementation for #245 #246: implementation PR merged into integration.
• observe: distinguish orphan-pending (no subscriber) from stuck-pending durable deliveries so chronic orphans don't mask real stuck deliveries #238: observe work that made the stuck-vs-orphan distinction visible.
  ⟦AI:FKST⟧

[codecov]

Codecov Report

❌ Patch coverage is 87.17949% with 35 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/fkst-framework/src/supervise/mod.rs	0.00%	23 Missing ⚠️
...tes/fkst-framework/src/supervise/delivery_store.rs	92.94%	11 Missing ⚠️
...es/fkst-framework/src/supervise/delivery_router.rs	95.83%	1 Missing ⚠️

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