spindle fork: modal-projects/spindle main afd2f22 + cherry-picks fb5bc80 (Dimuon on Miles LoRA) and 5148cb6 (SPINDLE_MILES_TREE) from branch claude/dimuon-spindle-wiring, + local commit cc3c64e799231e46d2656e918a380504b77462cc (trimuon family + optimizer observation metrics). miles tree mounted via SPINDLE_MILES_TREE: modal-projects/miles spindle-miles fdd808c merged with dimuon-lite 228b59d90 (= parent of withdrawn 45937c3bd8a1, an empty 'Withdrawn' commit), + local commit 0ab8c3c178a1631fbcbaab5e84804af487bdefb2 (TriMuon polar + family + timing/update-norm outcomes). TriMuon: no code at 45937c3b^; reimplemented from spec text with PS2_55 coefficients from github.com/zhehangdu/polar-switch@6f382f1.