Outreach Enrich

Run the enrich stage for one outreach run, one lead at a time. This is a Ralph per-unit stage: each invocation enriches exactly one lead, then checkpoints and emits a completion sigil so a driver can re-invoke for the next. The unit is one lead because the reasoning is per-lead; cost control comes from stopping the moment the required keys are filled.

Write back through twenty-engine-sync. Never write Twenty directly and never send.