The pet engine defined idle/run/review/wave/jump/failed, but the live
signals only ever drove a subset. Feed the dormant beats from signals
each surface already tracks, sharing one trigger via todos_all_done().
- CLI: review while reasoning, plus a transient end-of-turn flash —
failed on a tool error, jump on a finished plan, else wave.
- TUI: petFlashStore flashes jump/wave on message.complete and failed
on error; usePet honors the flash over derived state, auto-expiring.
- Desktop: wake the dead setPetActivity path — reasoning/tool/complete/
error now flash via flashPetActivity (gated to the active session);
the $petState computed drops stale tool/reasoning flags once at rest.
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