test: cover the env-key messages left unguarded by mutation testing

Mutation testing showed the negative structured-retries and expected-dim checks
in the env parsing path could be deleted with every test still passing. Their
value is the env key name in the message, so they need tests that assert it.

Changelog now states the real scope of this release and warns that normalising
scope moves the Redis keys, the one change here that silently relocates runtime
state. Records the breaker threshold derivation as deliberately env-only so it
does not resurface as another round.

tests/unit/test_embedding.py

@@ -358,6 +358,11 @@ class TestEmbeddingSettings:
         s = EmbeddingSettings.from_env("EMBED", env=env)
         assert s.normalize is True and s.expected_dim == 768
 
+    def test_expected_dim_must_be_positive(self):
+        """env 层的检查保留是为了报错能点出键名(构造期那道点的是字段名)。"""
+        with pytest.raises(ValueError, match="EXPECTED_DIM"):
+            EmbeddingSettings.from_env("EMBED", env={**self._ENV, "EMBED__EXPECTED_DIM": "0"})
+
     def test_from_settings_assembles_client(self):
         s = EmbeddingSettings.from_env("EMBED", env=self._ENV)
         client = EmbeddingClient.from_settings(s)