fix(agents): keep facets out of root-owned host job sync (#2299)

[threepointone]

Fixes #2299.

Problem

A facet has no alarm slot, but _syncHostJobs() ran on facets anyway. On every wake it opened a schedule_agent_alarm span for nothing. It also failed outright when a facet's startup fiber recovery left a row behind (for example, a throwing onFiberRecovered). It then pushed a housekeeping job whose setAlarm() threw, which failed the facet's first call after every restart.

Fix

_syncHostJobs() returns early on a facet. The root's facet-run lease already drives the retry that the housekeeping job was trying to schedule.

Edge case: earlier releases could persist a host job (destroy, keep-alive or housekeeping) in a facet's queue before the re-arm threw. The facet path cancels any such job on the next wake, so a job left over from an upgrade cannot re-arm again.

Tests

Two sub-agent tests:

• Host jobs are left to the root while a sub-agent's fiber recovery is pending.
• Host jobs that an earlier release left in a sub-agent's queue are dropped.

[changeset-bot]

🦋 Changeset detected

Latest commit: 59cad8a

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

This PR includes changesets to release 2 packages

Name	Type
agents	Patch
@cloudflare/agent-think	Patch

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[agent-think]

✅ agents import sizes: no significant changes (14f7c6a4 → 59cad8a5, workflow run)

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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commit: 59cad8a