feat(queues): add durable handlers and receipts

[NathanFlurry]

• Add durable queue delivery with idempotent sends, receipts, retries, handler timeouts, and dead-letter handling.
• Replace queue waiting and completion values with receipt status, rename handlers to onMessage, and document handler and raw receive acknowledgement behavior.
• Add protocol, runtime, client, test, example, and documentation coverage across TypeScript, Rust, NAPI, and Wasm.
• Remove checked-in generated icon package build artifacts.

[NathanFlurry]

Stack for rivet-dev/rivet

• #5457 feat(queues): add durable handlers and receipts 👈
• main

Get stack: forklift get 5457
Push local edits: forklift submit
Merge when ready: forklift merge 5457

_{change pskyqwyu}

[railway-app]

🚅 Deployed to the rivet-pr-5457 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
kitchen-sink	😴 Sleeping (View Logs)	Web	Jul 21, 2026 at 7:39 am
ladle	❌ Build Failed (View Logs)	Web	Jul 21, 2026 at 7:29 am
frontend-inspector	❌ Build Failed (View Logs)	Web	Jul 21, 2026 at 7:29 am
frontend-cloud	❌ Build Failed (View Logs)	Web	Jul 21, 2026 at 7:29 am
website	❌ Build Failed (View Logs)	Web	Jul 21, 2026 at 7:29 am
mcp-hub	✅ Success (View Logs)	Web	Jul 21, 2026 at 7:28 am