feat(mods): add hallowing pumpkin head example

[jamro]

What

First community mod, as a worked example of 3d_models/mods/<mod_name>/.

Adds an alternate head shaped like a pumpkin. Eye openings are cutouts over the OLED so the panel shows through the shell. Builds that use this head should set eyes_style=cover: the cover style fills each half of the 128×32 panel with a solid bar, so a hole of any shape stays lit, and existing blink / look sequences only change the black margins.

Other stock parts, and firmware stay unchanged. Cover rendering is already in firmware; this PR only adds the optional prints.

The mod may grow a few extra Halloween pieces in the same folder.

Layout:

3d_models/mods/pumpkin-head/
  cad/
  parts/
  README.md

CERN-OHL-S-2.0, same as the rest of 3d_models/.

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