Await heartbeat result projection before success

[roackb2]

Summary

• add an optional typed projectResult boundary to HeartbeatRunService
• await host durability/reconciliation work before resolving the handle or publishing the canonical result terminal
• make projector failure emit only the safe heartbeat error terminal
• preserve cancellation authority when handle or external cancellation races projection
• keep the legacy no-projector API and result types backward compatible

Verification

• focused heartbeat run-service tests: 8/8
• full unit suite: 142 files / 929 tests
• full integration suite: 49 files / 441 tests
• lint, multi-package typecheck, canonical build, and diff check

Boundary

This is a generic lifecycle ordering seam. It does not implement a working-set store, product settlement, scheduling, Execution Host wiring, release, or deployment.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.
To continue using code reviews, you can upgrade your account or add credits to your account and enable them for code reviews in your settings.