chore: embeddings.py warns on fallback for non-default models (T107)

tests/test_embeddings.py

@@ -20,6 +20,7 @@ The pseudo path doesn't touch the LLMClient, so we pass an empty
 
 from __future__ import annotations
 
+import logging
 import math
 
 import pytest
@@ -89,3 +90,33 @@ async def test_generate_embedding_unit_normalized():
     result = await generate_embedding(_client(), text="some non-empty text")
     norm_sq = sum(x * x for x in result.vector)
     assert math.isclose(norm_sq, 1.0, abs_tol=1e-6)
+
+
+@pytest.mark.asyncio
+async def test_generate_embedding_non_default_model_logs_warning(caplog):
+    """T107: non-default model falls through to fallback and must warn.
+
+    A Phase 4.5+ caller pointing at a real model that isn't yet wired
+    up would otherwise silently degrade (zero vector → useless cosine).
+    The warning surfaces the misconfiguration in logs.
+    """
+    caplog.set_level(logging.WARNING, logger="chat.services.embeddings")
+    result = await generate_embedding(_client(), text="hello", model="real-model")
+
+    # Behavior unchanged: still returns the fallback sentinel.
+    assert result.model == FALLBACK_EMBEDDING_MODEL == "fallback"
+    assert all(x == 0.0 for x in result.vector)
+
+    # Warning fired and names the offending model.
+    warnings = [r for r in caplog.records if r.levelno == logging.WARNING]
+    assert any("non-default model" in r.getMessage() for r in warnings)
+    assert any("real-model" in r.getMessage() for r in warnings)
+
+
+@pytest.mark.asyncio
+async def test_generate_embedding_default_model_does_not_warn(caplog):
+    """T107: the silent default path must stay silent."""
+    caplog.set_level(logging.WARNING, logger="chat.services.embeddings")
+    await generate_embedding(_client(), text="hello")
+    warnings = [r for r in caplog.records if r.levelno == logging.WARNING]
+    assert warnings == []