ConnectOnion 1.9.0a30 — never published

Never published. The tag's release CI failed on a concurrent-fetch test (#2253). These changes first became installable in 1.9.0a31. Do not pin a30.

Full-cohort concurrent onboarding and investigation

The a30 tag proposed removing the small default caps on onboarding and CLI investigations, so a first run could investigate the full mapped cohort in parallel:

1. Full-cohort onboarding by default: co rem init and co rem investigate investigate all mapped candidate people, all mapped projects with evidence, and all mapped organizations by default instead of truncating to small sample caps (--first-* flags remain available for opt-in dry runs).
2. 10-worker concurrent investigation pool: co rem investigate and onboarding page synthesis use up to 10 workers by default. The originally projected 10–25 minute full-cohort duration was not verified in a completed trial.
3. Thread-safe mail client sessions: Mailbox tools isolate API connections per thread (threading.local() for Google client sessions) to ensure high-throughput parallel fetching without socket buffer collisions.
4. Sandboxed task mask isolation: Parallel runner processes maintain private temporary task masks (private_task_mask()) preventing concurrent tasks from clearing active permissions or review staging areas.

Design rationale is documented in docs/design-decisions/077-concurrent-onboarding-investigation.md.

These changes apply when co rem investigates pages. Stable remains 1.8.10.