feat(notices): #99 stage-4 delivery substrate (runtime half)

[ScriptedAlchemy]

Summary

• acknowledge(id) on the notices handle: recipient-matched + authorization-gated (acknowledge phase), new terminal acknowledged state with invocation-stamped receipt
• Optional retryBudget / nextAttemptAt publish fields: admission re-attempts on later admitted events until the budget is exhausted, holds until due — evaluated only on admitted events per the V1 no-implied-timer rule; per-invocation attempt receipts stay idempotent
• signalAvailability() ledger verb: records wire-level resources/updated signals as availability receipts (state unchanged — protocol write success is availability, never delivery)
• Pure delivery-route selector over per-host advertisements (stable preference order, typed unavailable outcome, fail-closed on incomplete/reasonless advertisements)
• delivered deliberately stays out of the state union per the 2026-09-02 survey on Add recipient-aware notices and capability-gated delivery #99; taxonomy pin updated with the receipts mapping documented

Compatibility

• New notice fields are optional and never materialized by parse — proven by the cross-process sqlite suite whose child runs the previous dist against new-code replay (the head-vs-replay consistency check caught the .default() approach; switched to ?? 1 semantics)

Test plan

• notices suites 27/27 (5 new stage-4 behaviors + 3 router tests)
• full runtime suite 252 passed (single failure = load-sensitive dispatcher deadline test, green in isolation)
• build (publint gate), typecheck, lint

[changeset-bot]

🦋 Changeset detected

Latest commit: 56c1eaf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@agent-bundle/runtime	Patch
agent-bundle	Patch

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-03T04:19:23.809620Z	56c1eaf	PR opened

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