phase 2 review fixes

Three issues caught in Phase 2 review:

1. quarterly-shift-theory.md: day-quarter table conflated 6-hour
   wall-clock blocks (18:00-00:00, 00:00-06:00, etc) with named ICT
   sessions (Asia, London, NY AM, NY PM). They overlap but don't
   align — Asia session is 9h, day-Q1 is 6h. Removed session-name
   labels from the table; added explicit note that day quarters are
   independent of session naming. Fixed the visual diagram and
   Example 1 to match. Added a Common Mistake about the conflation.

2. killzone-overview.md: the formula's Asia-KZ midnight-wrap note
   wrote '[20:00, 24:00] U [00:00, 00:00]' which is mathematically
   the empty set on the second interval. The KZ doesn't actually
   wrap — it ends at 00:00. Replaced with prose clarification.

3. asian-range-sweep.md Example 1: had a 'Wait —' interjection that
   read like internal monologue. Rewrote as clean pedagogical
   ambiguity-resolution example.

JSON re-validated on all three.