Two-sensor topology modes

_Five distinct ways to deploy a Mega + Bolt pair. Ranked by recommendation, with CAD impact, software impact, calibration effort, BOM cost per unit shipped, and aesthetic readout._ **TL;DR — recommended primary path. Two complete bars, identical except for the front camera module. Mega-bar stays as Mac4 dev rig. Bolt-bar becomes the production-aesthetic flagship.** ### Geometry - Bar 1 (Mega): existing 500×120×85mm bar with current Mega cradle. Pod attached. K11 in pod. Wall-mount via pod VESA. - Bar 2 (Bolt): NEW slim bar at 500×120×60mm. Bolt cradle redesigned for 39mm depth + USB-C only. Pod attached. K11 in pod. Wall-mount via pod VESA. ### CAD impact - Net new Bolt-cradle module in `lume-shell.scad`. About 60 lines of SCAD. - New `lume-config-bolt.scad` overriding LUME_DEPTH=60, FEMTO_W=140 etc. - Bolt-bar shell halves regenerate at smaller dims (300×30×120, 200×30×120). - Pod stays identical between the two bars (K11 same, dims same). - **Estimated effort:** 1 day SCAD + half-day STL regen + half-day reslice in OrcaSlicer. ### Software impact - **Zero.** Both bars run the same wire format, same Unity components, same software. Two LUME bars = two unrelated installations from the software's perspective. Each has its own Mac running Unity, its own publisher, its own audio sidecar, its own user.