fix(metrics): re-arm turn guard in anchorUserSpeechStart — pipeline turns emit no metrics/transcript

[nicolotognoni]

Summary

One-line bug in both SDKs. In pipeline mode, every user→agent turn after the firstMessage emitted no per-turn metrics and no live dashboard transcript. Root cause: anchorUserSpeechStart() re-opens a turn (sets _turnStart) but did not clear the _turnAlreadyClosed guard left set by the previous turn's recordTurnComplete. Since startTurnIfIdle() no-ops once _turnStart is non-null, the guard never re-armed, so every subsequent recordTurnComplete() short-circuited to null.

emitTurnMetrics(null) then bails before MetricsStore.recordTurn(), which is what broadcasts the SSE turn_complete event the dashboard transcript subscribes to — so both the metrics and the live transcript share that dropped path (one root cause, not two bugs).

Symptoms (real Twilio + Deepgram + Cerebras + Inworld pipeline call)

• Dashboard LATENCY panel all — / 0 ms; COST panel empty per turn.
• Transcript only appears after the call ends, not live.
• Only one [event] metrics fired (turn 0 = firstMessage); the real user turns emitted transcript but no metrics.
• call_end metrics.turns had a single element despite 8 transcript entries.

Fix

Clear the guard in anchorUserSpeechStart(), mirroring what startTurn() already does:

• libraries/typescript/src/metrics.ts → this._turnAlreadyClosed = false;
• libraries/python/getpatter/services/metrics.py → self._turn_already_closed = False

Safe: anchorUserSpeechStart() no-ops once the turn is committed (_turnCommittedMono/_turn_committed_mono guard), so the flag is only re-armed at the start of a fresh, uncommitted turn — never the post-commit barge-in path the guard protects.

Breaking change?

No. Internal metrics-accumulator fix, no public API change.

Versioning

No version bump — lands under ## Unreleased → ### Fixed. Release rolls it into the next version later (not blocking). (package-lock.json version synced 0.6.2 → 0.6.3 to match package.json on main — stale lockfile, not a bump.)

Test plan

• New metrics-turn-rearm tests (TS + Python) — fail before the fix (recordTurnComplete returns null), pass after.
• Python: pytest tests/ -m "not soak" → 1940 passed.
• TypeScript: npm test → 1555 passed; npm run lint + npm run build clean.
• Parity: identical one-line fix + symmetric tests in both SDKs.