fix: update facade tests for contextvar hooks + fix ephemeral guard

The test_run_populates_tools_used_across_iterations,
test_run_populates_final_messages, and
test_run_user_hooks_still_fire_alongside_capture tests were reading
bot._loop._extra_hooks directly in their fake_process_direct mocks,
but the contextvar change moved per-call hooks to _per_call_hooks.

Also fixes the ephemeral guard: per_call hooks should not be used in
ephemeral mode (the original code incorrectly applied them regardless).

nanobot/agent/loop.py

@@ -728,7 +728,9 @@ class AgentLoop:
         )
         hook: AgentHook = loop_hook
         per_call = _per_call_hooks.get()
-        extra_hooks = per_call if per_call is not None else (self._extra_hooks if not ephemeral else None)
+        extra_hooks = None
+        if not ephemeral:
+            extra_hooks = per_call if per_call is not None else self._extra_hooks
         if extra_hooks:
             hook = CompositeHook([loop_hook] + extra_hooks)
 

tests/test_nanobot_facade.py

@@ -184,8 +184,10 @@ async def test_run_populates_tools_used_across_iterations(tmp_path):
     bot = Nanobot.from_config(config_path, workspace=tmp_path)
 
     async def fake_process_direct(message, *, session_key):
-        # Whatever hooks the SDK installed are now on the loop.
-        extras = bot._loop._extra_hooks
+        # Whatever hooks the SDK installed are now in the contextvar.
+        from nanobot.agent.loop import _per_call_hooks
+
+        extras = _per_call_hooks.get() or []
         messages = [{"role": "user", "content": message}]
         ctx1 = AgentHookContext(iteration=0, messages=messages)
         ctx1.tool_calls = [
@@ -217,7 +219,9 @@ async def test_run_populates_final_messages(tmp_path):
     bot = Nanobot.from_config(config_path, workspace=tmp_path)
 
     async def fake_process_direct(message, *, session_key):
-        extras = bot._loop._extra_hooks
+        from nanobot.agent.loop import _per_call_hooks
+
+        extras = _per_call_hooks.get() or []
         messages = [
             {"role": "user", "content": message},
             {"role": "assistant", "content": "hi there"},
@@ -266,7 +270,9 @@ async def test_run_user_hooks_still_fire_alongside_capture(tmp_path):
             seen_iterations.append(context.iteration)
 
     async def fake_process_direct(message, *, session_key):
-        extras = bot._loop._extra_hooks
+        from nanobot.agent.loop import _per_call_hooks
+
+        extras = _per_call_hooks.get() or []
         assert len(extras) == 2, f"expected capture + user hook, got {len(extras)}"
         ctx = AgentHookContext(iteration=7, messages=[])
         for h in extras: