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Startup synced the .ai/ templates into the current project every session but never checked the language bundle (elisp, python) installed in .claude/. Bundle drift went unnoticed until someone re-ran make install-lang by hand: a generic rule added to claude-rules/ after the last install, or a changed validator hook.
scripts/sync-language-bundle.sh closes that gap. It fingerprints which bundle a project has by the presence of the language's own rule files (elisp.md, python-testing.md), then reconciles against the canonical source: auto-fix for rulesets-owned files (.claude/rules/*.md, .claude/hooks/*, githooks/*), surface-only for settings.json, which a project may have customized. CLAUDE.md is left alone. It's seed-only in install-lang and project-owned afterward, the same reason diff-lang skips it.
Startup Phase A step 12 calls it for the current project, guarded so older checkouts that lack the script still boot. It writes only under .claude/ and githooks/, disjoint from the .ai/ rsync paths, so the parallel batch stays safe. A script rather than a make target keeps the Makefile-parse layer off the boot path. The absolute rulesets path it depends on is the same one the rsyncs already carry.
Tested: 11 bats cases (no-bundle, clean, drifted rule/hook auto-fixed, surfaced settings.json asserted unmodified, absent CLAUDE.md not flagged, python detection, $PWD default, bad path). A smoke run against a copy of a real elisp project's .claude/ caught a perpetual "CLAUDE.md missing" alarm, which is what drove dropping CLAUDE.md from the surface set.
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