PDCA cycle: orchestrator contract

The skill is loaded — the task is now driven strictly by the cycle below. Without it the contract does not apply: ordinary tasks are performed directly.

This skill targets .NET/C# repositories. The PLAN/CHECK checklists, coverage thresholds and role fallbacks reference .NET tooling and dotnet-* subagents; for another stack, treat them as a template and replace the tooling.

Models and providers live outside this skill. The skill names only roles; the host binds them to concrete subagents and models (see §Host requirements below). The design presumption is economy: a cheap orchestrator, cheap scout/coder, medium-tier planner/check/security-auditor, an expensive (strong) escalate used sparingly; if the host gives one model for everything, the cycle still works — just without the cost/quality split.