Follow-ups to the previous commit (#74155 by @Drexuxux):
- enrich_model_switch_warnings_for_gateway() -> merge_preflight_compression_warning()
still called the sync resolve_display_context_length() provider probe ladder
inline in both async /model call sites; dispatch it via asyncio.to_thread.
- Replace the inspect.getsource() test (source-reading tests are banned by
AGENTS.md) with behavioral tests that drive the real _handle_model_command:
assert the resolver runs off the loop thread and that the warning enrichment
is dispatched through asyncio.to_thread.
Teknium