The bridge gate compared reasoning_effort against the string "none", so
litellm's dict form ({"effort": "none"}) wrongly bridged; the gate now
reads the effort value from either form and treats a summary inside the
dict as Responses-only regardless of effort. Helicone and lunary
previously skipped custom tool calls entirely; both now serialize them
(helicone as a tool_use block from the custom payload, lunary with the
custom name and input in its function fields, keeping type custom), with
new mapped tests for both integrations
