Remove the free Parallel Search MCP path and restore the keyed Parallel backend behavior from before it was introduced. Also drops the keyless fallback registration/display labeling tests and returns the Parallel SDK pin to the prior version.
Remove the free Parallel Search MCP path and restore the keyed Parallel backend behavior from before it was introduced. Also drops the keyless fallback registration/display labeling tests and returns the Parallel SDK pin to the prior version.