feat(tui): replace footer hints with model telemetry

tests/agent/test_runner_hooks.py

@@ -3,7 +3,7 @@ cached-token propagation, and hook context."""
 
 from __future__ import annotations
 
-from unittest.mock import AsyncMock, MagicMock
+from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
@@ -143,6 +143,50 @@ async def test_runner_streaming_hook_receives_deltas_and_end_signal():
     provider.chat_with_retry.assert_not_awaited()
 
 
+@pytest.mark.asyncio
+async def test_runner_measures_stream_generation_without_time_to_first_token():
+    from nanobot.agent.hook import AgentHook
+    from nanobot.agent.runner import AgentRunner
+
+    provider = MagicMock(spec=LLMProvider)
+
+    async def chat_stream_with_retry(*, on_content_delta, **kwargs):
+        await on_content_delta("he")
+        await on_content_delta("llo")
+        return LLMResponse(
+            content="hello",
+            usage={"prompt_tokens": 100, "completion_tokens": 12},
+        )
+
+    provider.chat_stream_with_retry = chat_stream_with_retry
+    provider.chat_with_retry = AsyncMock()
+    tools = MagicMock()
+    tools.get_definitions.return_value = []
+
+    class StreamingHook(AgentHook):
+        def wants_streaming(self) -> bool:
+            return True
+
+    with patch(
+        "nanobot.agent.runner.time.perf_counter",
+        side_effect=[10.0, 10.2, 10.4, 10.8],
+    ):
+        result = await AgentRunner().run(make_run_spec(
+            provider,
+            initial_messages=[],
+            tools=tools,
+            model="test-model",
+            max_iterations=1,
+            max_tool_result_chars=_MAX_TOOL_RESULT_CHARS,
+            hook=StreamingHook(),
+        ))
+
+    assert result.usage["generation_ms"] == 600
+    assert result.usage["measured_completion_tokens"] == 12
+    assert result.usage["ttft_ms"] == 200
+    assert result.usage["timed_requests"] == 1
+
+
 @pytest.mark.asyncio
 async def test_runner_length_recovery_streams_segments_once_and_returns_all_content():
     from nanobot.agent.hook import AgentHook, AgentHookContext