feat: auto-continue failed idle runs

[i-am-thor]

Summary

• intercept the known zero-output state at before runner marks the trigger done
• send once into the same OpenCode session and keep the current run alive
• re-arm auto-resume after a later assistant on a new message id with nonzero tokens, with tests for one-shot suppression and zero-then-nonzero update ordering

Testing

• pnpm test packages/runner/src/trigger.test.ts
• pnpm --filter @thor/runner typecheck

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[Copilot]

Pull request overview

Adds an auto-recovery path in the runner's /trigger stream loop: when an assistant message.updated finishes with finish: "error" and zero tokens (no displayed output), and the session then idles, the runner sends a single "Continue" prompt into the same OpenCode session instead of terminating the trigger. The retry is one-shot per failed message id, and is re-armed only when a different assistant message id later updates with nonzero tokens.

Changes:

• Track latest assistant message.updated (id/finish/tokenTotal) plus a set of message ids that produced real text output.
• On parent session.idle, if the latest assistant message looks failed and unrecovered, send Continue once via client.session.promptAsync and keep the stream loop alive; on prompt error, fall through to the existing terminal path.
• Extend test harness (messageUpdatedEvent accepts id/finish, promptEvents receives prompt text) and add three new tests covering one-shot continue, duplicate suppression, and re-arm-after-success.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/runner/src/index.ts	Adds auto-resume bookkeeping, idle-time Continue send, and assistantMessageUpdateSummary() helper.
packages/runner/src/trigger.test.ts	Extends messageUpdatedEvent/harness and adds tests for the new auto-continue behavior.

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