protocol/protocol.py: sync (c) range docstring with v2.31.13 paper update

The cross_batch_direction_stability docstring claimed healthy values
"~0.05-0.18" and drift-dominated "~0.5-0.99" — these were the same
loose ranges that v2.31.13 corrected in the paper §6 ¶3.

Re-aggregated from results/protocol_audit/audit_table_s42_s123_s456.json
(K=10 batches of 128 samples):
  Healthy 6 BP+EP values: range [-0.036, 0.120], median 0.093
  Degen 9 DFA/SB/CB values: range [-0.005, 0.992], median 0.352
                           5/9 above 0.30 cutoff
                           3/9 above 0.50

Updated docstring to match the actual audit data and point at the
JSON source. Now the paper §6 ¶3 prose and the protocol.py docstring
agree exactly on the (c) calibration ranges.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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