Fireship-style SHORT (vertical faceless news short)

The long-form skill (fireship-style-edit) is the source of truth for the grammar: read its section 0 (LITERAL VISUALS) and section 3 (devices) first. This skill only changes what a phone needs. Both skills share one engine: fireship-style-edit/templates/fireship_engine.py, which switches to 1080x1920 when FIRESHIP_CANVAS=9:16 is set before import. templates/short_kit.py sets that and adds the vertical helpers, so a short's render.py starts with from short_kit import *.

Reference build: examples/weird-hack-short/render.py (the 60 s vertical cut of "The most interesting hack in history just got weirder", built from the same footage as the long-form edit).

1. What changes for vertical