tzinfo gem's ZoneinfoDataSource only checks hardcoded search_path
(/usr/share/zoneinfo, /usr/share/lib/zoneinfo, /etc/zoneinfo) — TZDIR
env is ignored. Locate the nix-store tzdata (filter on '*-tzdata*' to
skip Python's lib/zoneinfo) and symlink /usr/share/zoneinfo to it.
Keep TZDIR as belt+suspenders for tzset(3) consumers.

Previous TZDIR fix found Python 3.13's lib/python3.13/zoneinfo before the
tzdata package — those dirs contain the Python module, not POSIX zoneinfo
files, so tzinfo gem got 'No source of timezone data could be found'.
Filter the find to '*-tzdata*' paths + sanity-check Etc/UTC exists.

First Spindle run failed at config.rb:74 (Middleman 'Time.zone =' /
'set :timezone' line) with TZInfo::DataSources::ZoneinfoDirectoryNotFound.
tzinfo's default search path is ['/usr/share/zoneinfo', '/etc/zoneinfo'];
nixery's tzdata package puts zoneinfo under /nix/store/<hash>-tzdata-XXXX/
share/zoneinfo. Locate it via find + export TZDIR before the build step.

Empty commit to fire the .tangled/workflows/render.yml on the freshly-linked
Spindle for utensil.tngl.sh/writings.

Mirrors .github/workflows/ruby.yml (GH lane → utensil.github.io/writings).
Same Middleman template as tech. Two independent lanes, no cross-deps.
Needs DEPLOY_SSH_KEY_B64 secret on tangled writings repo.

Keep lib/mytemplate.rb in sync with utensil/tech: bridge the fence language
onto <code class> so highlight.js honors it, and mark text/unlabeled blocks
nohighlight so they render plain instead of being auto-detected.