persona-cast — a pre-built review cast a field harness can use without knowing the container

Why this exists (operator decision 2026-09-12): FH can synthesize personas on demand through persona_container_schema.md, but a field harness cannot — it would have to fill seven slots, pick a tiering rule and run a marginal-coverage stop every time. What a field harness can use is the container's output, pre-baked: a cast of review-shaped lenses plus one doorway. This skill is that doorway, the same shape as harness-pr-reviewer (a standalone way in to one FH capability).

Role split: sim-conductor synthesizes personas for a simulation and owns the parallax shape. persona-roster-expander turns a named seed into a tiered cast. persona-cast dispatches an already-built cast at an artifact. It builds nothing; a missing lens is a request to the two skills above, never inline improvisation.

Casts (shipped in plugins/fh-commons/agents/*-lens.md)