docs: correct the follow-up tool call claimHEADmaster

The comments and README stated flatly that a second tool call always comes
back as literal <tool_call> XML. On llama.cpp b10208 that is no longer true:
forcing a follow-up by starving the first search gave 1/5 parsed as a
structured call, 1/5 leaking XML, 3/5 answered without searching again.
Earlier builds never parsed it.

Still not reliable enough to raise max_searches, since the failure mode is
a blank reply, but the wording should not read as permanent when it was
measured once against one build.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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