- Step 3.5: fetch signerEmail from tokenRow after atomic claim
- Step 7: accumulate pattern — read from signedFilePath or preparedFilePath as working PDF
- Step 7: write to JTI-keyed _partial_ path to prevent concurrent signer collisions
- Step 8a: date stamps scoped to this signer's date fields (D-09)
- Step 8b: signable fields scoped to this signer's fields (Pitfall 4)
- Step 9.5: JTI-keyed datestamped temp file to prevent collision
- Step 10.5: update signedFilePath to this signer's partial after each signing
- Step 11: remaining-token count check before completion attempt
- Step 11: completionTriggeredAt atomic guard (UPDATE WHERE IS NULL RETURNING)
- Step 12: status='Signed' only in completion winner block (fixes first-signer-wins bug)
- Step 13: agent notification + signer completion emails only at completion
- Legacy null-signerEmail tokens fall through all signer filters unchanged
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