Re-sequence schedule for day-to-day variety (coach-style)

Variety-aware local search reassigns metcons across days, swapping only within class
(team/regular/deload) and only where each day stays audit-valid and near its time
target. Minimizes consecutive-day similarity: shared movements, repeated format, same
modality shape (W+G+M), same time domain. Result across the year: consecutive-day
movement repeats 65 -> 3, same-format adjacency 249 -> 159, while in-band time target
holds (335 -> 331) and deload conditioning stays light. No more Wall Ball three days
running or six-of-seven For Time weeks.

Author: OneMuppet