Enforce resolved execution context for deterministic actor policy

tests/manifest-schema.test.ts

@@ -76,6 +76,21 @@ test("parses a valid AgentManifest", () => {
   assert.equal(manifest.relationships.length, 1);
 });
 
+test("parses optional persona modelConstraint", () => {
+  const manifest = validManifest() as {
+    personas: Array<Record<string, unknown>>;
+  };
+  manifest.personas[1] = {
+    ...manifest.personas[1],
+    modelConstraint: "claude-3-haiku",
+  };
+
+  const parsed = parseAgentManifest(manifest);
+  const coder = parsed.personas.find((persona) => persona.id === "coder");
+  assert.ok(coder);
+  assert.equal(coder.modelConstraint, "claude-3-haiku");
+});
+
 test("rejects pipeline cycles", () => {
   const manifest = validManifest() as {
     pipeline: {
@@ -136,3 +151,18 @@ test("rejects legacy edge trigger aliases", () => {
     /unsupported event "onValidationFail"/,
   );
 });
+
+test("rejects empty persona modelConstraint", () => {
+  const manifest = validManifest() as {
+    personas: Array<Record<string, unknown>>;
+  };
+  manifest.personas[0] = {
+    ...manifest.personas[0],
+    modelConstraint: "   ",
+  };
+
+  assert.throws(
+    () => parseAgentManifest(manifest),
+    /modelConstraint/,
+  );
+});