fix(render): iter 101 — stash iter 100 OTF symlink diagnostics to debug log
Iter 100 created OTF symlinks via 'find TEXLIVE_TEXMF' but I have no
visibility into whether TEXLIVE_TEXMF was set or how many symlinks
landed. Add env + symlink summary to deployed _debug-staging.log so I
can read the actual state via clone.
Refs #2
[AGENT: kael]