Add local live smoke test suite (#148)

## Summary
- add an opt-in local `smoke/` pytest suite for API, auth, providers,
CLI, IDE-shaped requests, messaging, voice, tools, and thinking stream
contracts
- keep smoke tests out of normal CI collection with `testpaths =
["tests"]`
- write sanitized smoke artifacts under `.smoke-results/`

## Verification
- `uv run ruff format`
- `uv run ruff check`
- `uv run ty check`
- `uv run ty check smoke`
- `FCC_LIVE_SMOKE=1 FCC_SMOKE_TARGETS=all FCC_SMOKE_RUN_VOICE=1 uv run
pytest smoke -n 0 -m live -s --tb=short` -> 17 passed, 9 skipped
- `uv run pytest` -> 904 passed

## Notes
- Skipped live checks require local credentials/tools/services, such as
provider models, Telegram/Discord targets, voice backend, or Claude CLI.
- `claude-pick` smoke was intentionally removed.

tests/providers/test_converter.py

@@ -79,6 +79,27 @@ def test_convert_tools():
     assert result[1]["function"]["description"] == ""  # Check default empty string
 
 
+@pytest.mark.parametrize(
+    "tool_choice,expected",
+    [
+        (
+            {"type": "tool", "name": "echo_smoke"},
+            {"type": "function", "function": {"name": "echo_smoke"}},
+        ),
+        ({"type": "any"}, "required"),
+        ({"type": "auto"}, "auto"),
+        ({"type": "none"}, "none"),
+        (
+            {"type": "function", "function": {"name": "already_openai"}},
+            {"type": "function", "function": {"name": "already_openai"}},
+        ),
+    ],
+)
+def test_convert_tool_choice(tool_choice, expected):
+    result = AnthropicToOpenAIConverter.convert_tool_choice(tool_choice)
+    assert result == expected
+
+
 # --- Message Conversion Tests: User ---