## Summary
- preserve valid onboarding JSON returned in Pi thinking-only assistant
blocks
- retry one bounded JSON-only reformat turn when the model returns prose
or malformed output
- keep streamed output as a final extraction fallback instead of
overwriting it with an empty content array
## Verification
- `pnpm --filter @fusion/dashboard exec vitest run
src/__tests__/agent-onboarding.test.ts` — 20 passed
- `pnpm --filter @fusion/dashboard typecheck`
- `pnpm lint`
- `pnpm check:changesets --strict`
- live local-runtime AI Interview produced a structured
Hermes/computer-use onboarding question after restart
Follow-up to #2142, which fixed the missing planning-model fallback and
runtime-hint prompt.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved agent onboarding recovery when assistant replies include
thinking-only content or malformed JSON.
* Added a single automatic retry that re-formats invalid output into
valid onboarding JSON.
* Preserved structured “thinking” content as part of valid onboarding
responses.
* Normalized optional onboarding fields so null/empty/whitespace-only
values are treated as missing.
* Tightened Hermes automation so the runtime hint is set exactly to
`hermes`.
* **Tests**
* Added onboarding event synchronization and expanded coverage for
recovery and field normalization.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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