refactor(gen_web_hook): skip writes when content unchangedHEADmaster

Adds write_if_changed: generates to a same-fs temp file, skips mv if
cmp -s matches, otherwise atomically replaces. Trap ensures cleanup on
failure. All header/footer write sites ported to use it.

Also merges write_header/write_category_header into one function
(optional cat_name arg for the pill), and splits footer_sig into
footer_sig_inner so generate_root_footer can reuse the sig block
without duplicating HTML.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions