Pre-commit hook doesn't flag deleted build assets (js/css)

[moodyjmz]

TL;DR: .githooks/pre-commit only checks staged files with --diff-filter=ACM (Added/Copied/Modified), never D (Deleted). Before #129, local builds never deleted anything under js//css/ (fixed js/ filenames, css/ only grew), so the gap was invisible. After #129 (which empties css/ before each build to stop stale hashed chunks from accumulating), a local npm run build && git commit -am ... will silently commit CSS deletions — the hook stays quiet, and CI's npm-build "check build changes" job even goes green on that commit since the output matches.

Detail

• .githooks/pre-commit line ~14: git diff --cached --name-only --diff-filter=ACM -- js/ css/ (or equivalent) never surfaces deleted paths, so the hook's "you're about to commit generated build assets" guard silently misses deletions.
• This repo's intended flow (per AGENTS.md) is: contributors run npm run build locally to test, then git restore --staged js css before committing — the hook is meant as a backstop for anyone who forgets. That backstop has a hole specifically for deletions.
• Suggested fix: include D in the --diff-filter (e.g. --diff-filter=ACMD), so a staged deletion under js//css/ trips the same warning as an addition/modification.
• Found during review of build: remove outdated CSS files when building #129 (build: remove outdated CSS files when building).