feat: add executor gateway contracts

services/orchestrator/README.md

@@ -93,6 +93,23 @@ reasons, task-type distribution, Native terminal coverage, recent decisions,
 and an explicit alert if any stored decision ever reports
 `handoffAllowed=true`.
 
+Phase 3.2 establishes the Executor Gateway boundary:
+
+- `executor-job-request-v1`, `executor-job-state-v1`, and
+  `executor-dispatch-decision-v1` remain independent of Goosed, Aider,
+  OpenHands, and LangGraph SDK types;
+- jobs use workspace and artifact references rather than host filesystem paths;
+- the store contract provides atomic idempotency, lookup, and state update
+  operations;
+- timeout, cancellation, fallback, authorization, network, and side-effect
+  controls are normalized before adapter selection;
+- Goosed, Aider, and OpenHands are registered as `contract-only` adapters;
+- the reference memory store is explicitly non-durable and used only for local
+  contract tests.
+
+`EXECUTOR_DISPATCH_IMPLEMENTED=false` is a code-level gate. Phase 3.2 can record
+blocked, idempotent job state but cannot invoke an adapter or launch a process.
+
 The default memindadm mode remains `off`. Canary and Active routing are not
 wired to the LangGraph executor in Phase 3. Native Agent Run remains the sole
 executor in every mode.