feat(ack): support project agent routing overrides

tests/test_ack_worker_profiles.py

@@ -224,6 +224,39 @@ class CanonicalHashTests(unittest.TestCase):
 
 
 class ProfileValidationTests(unittest.TestCase):
+    def test_pi_default_model_is_explicitly_supported(self) -> None:
+        routing = {
+            "profileVersion": 1,
+            "mode": "orca",
+            "modelAllowlist": {
+                "pi": {
+                    "developer": {"standard": [None], "strong": [None]},
+                },
+                "cursor-agent": {"test": {"standard": ["auto"]}},
+            },
+            "profiles": {
+                "pi-dev": {
+                    "role": "developer",
+                    "cli": "pi",
+                    "tier": "standard",
+                    "model": None,
+                    "reasoningEffort": "medium",
+                    "permissionMode": "workspace-write",
+                },
+                "cursor-test": {
+                    "role": "test",
+                    "cli": "cursor-agent",
+                    "tier": "standard",
+                    "model": "auto",
+                    "reasoningEffort": None,
+                    "permissionMode": "workspace-write",
+                },
+            },
+            "defaults": {"developer": "pi-dev", "test": "cursor-test"},
+        }
+
+        self.assertEqual(worker_profiles.validate_orchestration(routing), [])
+
     def test_valid_orchestration_passes(self) -> None:
         self.assertEqual(
             worker_profiles.validate_orchestration(valid_orchestration()),
@@ -406,6 +439,44 @@ class ProfileValidationTests(unittest.TestCase):
 
 
 class ArgvRendererTests(unittest.TestCase):
+    def test_pi_default_model_omits_model_flag(self) -> None:
+        profile = {
+            "role": "developer",
+            "cli": "pi",
+            "tier": "standard",
+            "model": None,
+            "reasoningEffort": "medium",
+            "permissionMode": "workspace-write",
+        }
+
+        self.assertEqual(
+            worker_profiles.render_worker_argv(
+                profile,
+                "/home/ace/.local/share/mise/shims/pi",
+                "/repo/demo",
+            ),
+            [
+                "/home/ace/.local/share/mise/shims/pi",
+                "--thinking",
+                "medium",
+            ],
+        )
+
+    def test_pi_read_only_limits_tools(self) -> None:
+        profile = {
+            "role": "test",
+            "cli": "pi",
+            "tier": "standard",
+            "model": None,
+            "reasoningEffort": "low",
+            "permissionMode": "read-only",
+        }
+
+        self.assertEqual(
+            worker_profiles.render_worker_argv(profile, "/usr/local/bin/pi", "/repo/demo"),
+            ["/usr/local/bin/pi", "--thinking", "low", "--tools", "read,grep,find,ls"],
+        )
+
     def test_codex_exact_safe_argv(self) -> None:
         profile = valid_orchestration()["profiles"]["codex-dev-standard"]