Stop fighting FreeBSD's PYTHON_DEFAULT=3.11: make python3 resolve to 3.11
(python312 stays installed and available as python3.12 for anything needing
newer). This also makes Pillow trivial — py311-pillow imports on plain python3,
so the image-render/screenshot skill needs no version gymnastics.
- build.sh: python3/python symlink → 3.11 (prefer python3.11, else lowest).
- pkg-list-live-operator.txt: add py311-pillow.
- clawdie-join-hive.sh: advertise image-render when `python3 -c import PIL`
works, and screenshot when $DISPLAY is set.
- BUILD.md: short note (python3=3.11; python3.12 available; image-render via
py311-pillow).
Validated: sh -n build.sh + join-hive clean; markdown gate clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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