v123: BEST FREE RESULT - ws+tab collapse component +0.0038355487 at retention exactly 0.0, 0 content chars touched, 10.3x the v118 strip. Blank-line collapse LOSES (-13913 chars but +6636 tokens): a run of N newlines costs ONE token, so the audit average rate pointed the wrong way. Fixed a backslash-doubling bug in my own safety CHECK; 825 tests
