select

Swarm-ready work selector: choose one source (invocation list, `SLICES.md`, or `plan-N.md`), refine it into dependency-aware atomic tasks, and emit an OrchPlan (waves + delegation) plus optional pipelines. Use for prompts like `$select`, `use $select`, `pick the next ready slice`, `orchestrate workers from SLICES`, or `what should run in parallel next`. Plan-only; no writeback; orchestration-agnostic.