Add parametric 3D-printable enclosure (OpenSCAD)

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A printable reimagining of the wooden Kidsbox: rectangular cabinet with two
front speakers, removable top lid (NFC tag rests there, reader mounts beneath),
and swappable speaker mounts.

- kidsbox.scad: master model + part dispatcher (body/lid/speaker_adapter/grill)
- params.scad: all tunable dimensions in one place
- lib.scad: helper modules (rounded shell, bosses, bolt circles)
- Fixed front-panel speaker interface + swappable adapter so any driver fits
  by printing a new adapter (edit spk_* params, re-export)
- Internal mounts: 2x18650 cradle, ESP32-LyraT standoffs, RC522 under lid,
  3 buttons on lid, USB/charge + power-switch side ports, back-wall vents
- Snap-in speaker grills
- Makefile to export STLs and render previews (headless via xvfb)
- Exported STLs and preview renders included
- Link enclosure from main README

Dimensions are sensible defaults from the reference photos and common parts;
README flags the fit-critical values to verify before mass-printing.

https://claude.ai/code/session_01MhAnh68DPNnTjcKqjNYDmk

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Claude committed 2026-06-13 10:39:55 +00:00

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