* feat: add orch-* orchestrator skill family
Lightweight wrappers that orchestrate existing ECC agents through a gated Research -> Plan -> TDD -> Review -> Commit pipeline, right-sized per task.
- orch-pipeline: shared engine (phases, size classifier, two gates, agent map)
- orch-add-feature/change-feature/fix-defect/refine-code/build-mvp: thin wrappers delegating to the engine
* chore: register orch-* family in catalog, command registry, and agent.yaml (post-rebase onto green main)
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Co-authored-by: ECC Test <ecc@example.test>
