pxx 2.4.3

Fixed

• Reviewer/judge now decodes greedily (temperature: 0) — the review gate is reproducible.
  The model-backed reviewer's request omitted temperature, so against an Ollama endpoint the
  server default (0.8) made the judge nondeterministic: the same diff produced different
  verdicts run-to-run, and pxx calibrate swung across its MIN_AGREEMENT / MIN_RECALL
  thresholds — so a calibrated reviewer couldn't be trusted to stay calibrated, and a single
  calibration near a threshold was a coin-flip. pxx/review.py now sends temperature: 0, pinning
  the judge to greedy decoding. Surfaced by a reachable → unparseable → calibrate → replace
  reviewer diagnostic that exposed the swing. Test asserts the reviewer payload carries
  temperature == 0.