v0.4.2

0.4.2 re-sizes the default review cadence from measurements instead of a round
number.

Why

• Re-measured over 43 sessions (20,576 step intervals, 103 reviews): a step is
  9.6 s median (p75 18.8 s), a concluded review 52 s (p75 113 s, p90 151 s), and
  a quarter of reviews hit the 180 s deadline.
• The median turn is 21 steps, and the ten-step default left 72 of the 79
  reviewed turns with exactly one review: a typical turn's second half was
  judged only once the session continued. Median detection delay was 3.2 min
  (p90 8.3 min).
• Replaying 242 recorded turns with the measured durations: eight steps takes
  ~20 s off the median and ~70 s off the p90 delay for ~15 % more review calls.
  Coverage (work judged before its turn ends) is flat across 6–12 steps, so the
  cadence is a latency/cost dial; eight is where the delay gain is still cheap.

Changed

• Default review.everySteps 10 → 8 (a configured value keeps its value).
• The page bundle's fallback default and both READMEs follow.
• DECISIONS records the measurements, the replay table and why not fewer steps;
  the reload test derives its pre-reload count from the configured cadence.