feat(ql3): establish 3.0 incubation baseline

back/runtime/ports/runDispatchPlanSource.ts

@@ -0,0 +1,10 @@
+import type { RunDispatchCandidate } from '../domain/runDispatchCandidate';
+import type { RunDispatchPlan } from '../domain/runDispatchOffer';
+
+/**
+ * Prepares one bounded plan in trusted control-plane memory. The Dispatcher must
+ * not expose it as an execution offer until the corresponding lease is claimed.
+ */
+export interface RunDispatchPlanSource {
+  prepare(candidate: RunDispatchCandidate): Promise<RunDispatchPlan | null>;
+}