Use beam search in whisper, tell the model about misheard words

Whisper wrote "Che ori sono?" twice in one day and the model once
answered with the weather. On 10 recorded short questions beam search
(beam_size=5) gets 9 right against 8 for greedy, for 0.06 s more; an
initial prompt also got 9 but lost one question entirely, so it is not
used.

The default system prompt now says the user's words come from speech
recognition and should be read by how they sound: on "Che ori sono?"
stray tool calls went from 1 in 10 to none, other tools unaffected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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