fix(reasoning_effort_grid_v4): grant sonnet-4-6 entries the max-effort cap

The runtime _validate_effort_for_model allows effort='max' for any
Claude 4.6 model (opus or sonnet), and model_prices_and_context_window
sets supports_max_reasoning_effort: true for claude-sonnet-4-6. The
grid spec previously gave sonnet-4-6 entries _CAPS_NONE, so expected()
returned status=400 for effort='max', which mismatched the runtime's
status=200 and caused 6 cells (one per route) to fail.

Rename _CAPS_OPUS_4_6 to _CAPS_4_6 (since the cap set is shared by
opus and sonnet 4.6) and assign it to all sonnet-4-6 entries.

Co-authored-by: Yassin Kortam <yassin@berri.ai>

Author: cursoragent

tests/test_litellm/reasoning_effort_grid_v4/grid_spec.py

@@ -114,7 +114,7 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
 _CAPS_OPUS_4_7: FrozenSet[str] = frozenset(
     {"supports_xhigh_reasoning_effort", "supports_max_reasoning_effort"}
 )
-_CAPS_OPUS_4_6: FrozenSet[str] = frozenset({"supports_max_reasoning_effort"})
+_CAPS_4_6: FrozenSet[str] = frozenset({"supports_max_reasoning_effort"})
 _CAPS_NONE: FrozenSet[str] = frozenset()
 
 
@@ -131,7 +131,7 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
         model="anthropic/claude-sonnet-4-6",
         mode="adaptive",
         required_env=_ANTHROPIC_REQ,
-        caps=_CAPS_NONE,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="claude-haiku-4-5",
@@ -156,14 +156,14 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
         model="azure_ai/claude-opus-4-6",
         mode="adaptive",
         required_env=_AZURE_FOUNDRY_REQ,
-        caps=_CAPS_OPUS_4_6,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="azure-claude-sonnet-4-6",
         model="azure_ai/claude-sonnet-4-6",
         mode="adaptive",
         required_env=_AZURE_FOUNDRY_REQ,
-        caps=_CAPS_NONE,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="azure-claude-haiku-4-5",
@@ -190,15 +190,15 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
         mode="adaptive",
         extra_params=(("vertex_location", "us-east5"),),
         required_env=_VERTEX_REQ,
-        caps=_CAPS_OPUS_4_6,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="vertex-claude-sonnet-4-6",
         model="vertex_ai/claude-sonnet-4-6",
         mode="adaptive",
         extra_params=(("vertex_location", "us-east5"),),
         required_env=_VERTEX_REQ,
-        caps=_CAPS_NONE,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="vertex-claude-haiku-4-5",
@@ -226,15 +226,15 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
         mode="adaptive",
         extra_params=(("aws_region_name", "us-east-1"),),
         required_env=_BEDROCK_REQ,
-        caps=_CAPS_OPUS_4_6,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="bedrock-claude-sonnet-4-6",
         model="bedrock/converse/us.anthropic.claude-sonnet-4-6",
         mode="adaptive",
         extra_params=(("aws_region_name", "us-east-1"),),
         required_env=_BEDROCK_REQ,
-        caps=_CAPS_NONE,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="bedrock-claude-sonnet-4-5",
@@ -254,15 +254,15 @@ def expected(model: ModelEntry, effort: str) -> CellExpectation:
         mode="adaptive",
         extra_params=(("aws_region_name", "us-east-1"),),
         required_env=_BEDROCK_REQ,
-        caps=_CAPS_OPUS_4_6,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="bedrock-invoke-claude-sonnet-4-6",
         model="bedrock/invoke/us.anthropic.claude-sonnet-4-6",
         mode="adaptive",
         extra_params=(("aws_region_name", "us-east-1"),),
         required_env=_BEDROCK_REQ,
-        caps=_CAPS_NONE,
+        caps=_CAPS_4_6,
     ),
     ModelEntry(
         alias="bedrock-invoke-claude-opus-4-5",