feat(grid-agent): add chat and IM interactions (#123)

crates/metacrate-grid-agent/tests/policy_gateway.rs

@@ -225,3 +225,34 @@ fn authenticated_uuid_not_message_text_controls_im_authority() {
         .expect("decision");
     assert_eq!(result.disposition, PolicyDisposition::Denied);
 }
+
+#[test]
+fn interaction_intent_capability_filter_can_only_narrow_origin_allowed_tools() {
+    let authorized = id("11111111-1111-4111-8111-111111111111");
+    let audit = Arc::new(MemoryPolicyAudit::new(16).expect("audit"));
+    let gateway = PolicyGateway::new(
+        BTreeSet::from([authorized]),
+        vec![tool("inspect", true), tool("move", false)],
+        PolicyLimits::default(),
+        audit,
+    )
+    .expect("gateway");
+    let context = PolicyRequestContext::new(
+        ActionOrigin::instant_message(authorized),
+        "intent-session",
+        "intent-correlation",
+    )
+    .expect("context");
+    let informational = gateway.tools_for_capability_set(
+        &context,
+        100,
+        &BTreeSet::from([Capability::Informational]),
+    );
+    assert_eq!(informational.len(), 1);
+    assert_eq!(informational[0].name.as_str(), "inspect");
+    assert!(
+        gateway
+            .tools_for_capability_set(&context, 100, &BTreeSet::new())
+            .is_empty()
+    );
+}