fix: harden authoring schema and contract projections

web/packages/rpc/src/json-schema/authored-rpc-fixtures.ts

@@ -531,7 +531,9 @@ export const authoredRpcSchemas = {
     payload: Schema.Struct({
       workspace_id: Schema.String.pipe(Schema.minLength(1)),
       revision: PositiveIntegerSchema,
-      selected_step_id: Schema.optional(Schema.NullOr(Schema.String)),
+      selected_step_id: Schema.optional(
+        Schema.NullOr(Schema.String.pipe(Schema.minLength(1))),
+      ),
     }),
     success: Schema.Union(AuthoringContractInventorySchema, DraftWorkspaceSchema),
   },

web/packages/rpc/src/json-schema/rpc-parity.test.ts

@@ -548,7 +548,11 @@ const parityCases: ReadonlyArray<ParityCase> = [
       revision: 7,
       selected_step_id: "render",
     },
-    invalidPayload: { workspace_id: "console.demo", revision: 0 },
+    invalidPayload: {
+      workspace_id: "console.demo",
+      revision: 7,
+      selected_step_id: "",
+    },
     validSuccess: authoringContractInventory,
     invalidSuccess: {
       ...authoringContractInventory,