fix(board): clear heartbeat_at on release so the next owner has no stale liveness

[namastex888]

What

releaseTask returned an in_progress card to ready and cleared claimed_by/claimed_at but left heartbeat_at behind. After a release the card kept the prior owner's pulse, so when a new worker checked it out the liveness badge computed from the old heartbeat and could show a fresh checkout as ▶ running before it ever pulsed.

Fix

Clear heartbeat_at in the same conditional release UPDATE (the atomic WHERE ... AND status = 'in_progress' CAS is unchanged, so the done-card no-resurrection and phantom-event guarantees hold). Added a regression test: release → heartbeatAt null → survives re-claim. Right-reason verified (test fails without the source change).

Provenance

Found by the codex bot's P2 review comment on the #2619 dev→main promotion; deferred out of that promotion and landed here per the resolution note. typecheck / biome clean; bun test src/lib/v5/task-state.test.ts → 67 pass / 0 fail.

[gemini-code-assist]

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