Define Railiance app contract

docs/deployment-lifecycle.md

@@ -54,9 +54,10 @@ Each stage emits a machine-readable result with:
 ## Workload Declaration
 
 Each participating workload should declare its promotion contract in a
-repository-local `railiance/app.toml`. The full schema is defined by the next
-workplan task, but this lifecycle expects every workload declaration to provide
-at least:
+repository-local `railiance/app.toml`. The contract is defined in
+`docs/app-toml-contract.md`, with a machine-readable schema at
+`schemas/railiance-app.schema.json`. This lifecycle expects every workload
+declaration to provide at least:
 
 - stable workload name and owning repo;
 - source revision, image tag, or image digest policy;