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buildStage2Prompt() renders MVCP M.15's confirmed one-step six-section template and enforces the two dynamic risks M.15.1 flagged: caps appearanceDescriptor/garmentDescriptor at ~40 words each, and truncates motionDescriptor if it alone would push detailed_description past H6's 500-word cap (the only placeholder that lands in that section). Also fixes the footwear-drift the S1 spike found (model self-selected shoes when the prompt didn't constrain them) — pins footwear to <Picture 1> in both subject_definitions and retention_analysis, and says <Picture 2> doesn't affect it. Propagated the same fix into the M.15 template in the MVCP doc so the doc and the code don't drift. Tests check the mechanical M.15.1 items that are checkable from the rendered string (H1/H5/H6/H9) plus the truncation behavior and the footwear fix. H13 (reference counts) is a submission-payload concern, covered by T8's tests instead.
