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The python and typescript bundles carried rules and a coverage script but no pre-commit hook, so any project installing one got no credential scan on commit. Both now ship all four components the README documents: the shared secret scan, a validate-on-edit hook, settings wiring, and a seed CLAUDE.md. Verified against a real repo: a commit carrying an AWS key is refused.
install-lang now warns when a bundle is missing a documented component. That's the half that keeps this from recurring. Whoever adds the sixth bundle will forget something too, and today the installer prints success either way.
Two things fell out of the build. node --check is unusable on TypeScript: it ignores --experimental-strip-types, so it rejects valid TS and accepts broken TS. The hook uses tsc filtered to syntactic diagnostics instead. And completing the bundles means every pair now collides on settings.json and pre-commit, so no two compose without FORCE=1. The earlier "bundles already compose" reading rested on these two being incomplete. Filed for a real decision; clock-panel is the project that wants it.
Also stamps :LAST_REVIEWED: at task creation, with a lint checker to catch misses. Writing a task is reviewing it, so leaving the stamp off pushed every fresh task to the top of the next review batch to be re-derived by someone with less context than its author had. Tonight's sweep sent the staleness count from 13 to 22 while the list got more accurate.
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The secret scan ran every pattern through grep -iE, so AKIA[0-9A-Z]{16} matched any mixed-case 20-char run. Random base64 in an embedded image blob hits that about 6% of the time per 100KB, enough to block a real commit and force --no-verify. takuzu hit it on a PNG sprite. AWS keys are uppercase, sk- keys lowercase, and PEM headers fixed, so those three now match case-sensitively. Only the keyword=value patterns still need -i.
I measured both causes first. Across ~10MB of random base64 the old pattern produced 7 matches and would have false-positived 6 of 100 sprite-sized blobs. Case-sensitive matching produced none.
takuzu's report also proposed skipping any added line containing ";base64,". I left that out. It guards against an uppercase AKIA run surviving the case fix, which never occurred in the sample and runs about one in a million per blob. The cost is real: minified bundles put a whole file on one line, so a data URI and a live key can share it, and skipping the line hides the key. A test covers that.
The three variants share one scan block, so elisp, bash, and go all carry the change. Splitting one grep into two meant a line matching both passes got reported twice, which reads as two separate leaks. awk dedupes it.
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The Go bundle was coverage-slice-only. Because it shipped no rule files, sync-language-bundle.sh (which fingerprints a project's bundle by spotting one of its rule files in .claude/rules/) couldn't detect it, so the coverage slice it did ship never stayed in sync. Adding the rules is what makes the bundle sync-maintainable, which was the point.
Brought Go to the full tier, matching elisp:
- claude/rules/go.md and go-testing.md, the style and testing rules (table-driven tests, go test -race, errors.Is over message matching, how the coverage slice fits). These two are also the sync fingerprint.
- claude/hooks/validate-go.sh, a PostToolUse hook that runs gofmt and go vet on each edited .go file. go vet type-checks, so compile and syntax errors surface at edit time. It deliberately doesn't auto-run tests, since a package's tests can be slow or integration-tagged and shouldn't fire on every keystroke.
- claude/settings.json, Go permissions plus the hook wiring.
- githooks/pre-commit, a secret scan and a gofmt check on staged .go.
- CLAUDE.md, the seed.
validate-go.sh is TDD'd by scripts/tests/validate-go.bats: a clean file passes, gofmt and vet failures both block with the JSON payload, and non-go, missing, or empty paths are ignored. I updated install-lang.bats test 7, which asserted Go installs no CLAUDE.md, to check the full bundle instead. Verified with a real install into a throwaway project and a green make test.
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Third language in the coverage-summary fan-out, after Elisp and Python. Same kernel: count every source file on disk that's absent from the coverage profile as 0% and weight the project number by file, so an untested file stays visible instead of being averaged away.
The script at languages/go/claude/scripts/coverage-summary.go parses a cover.out profile, maps each import-path-qualified entry back to an on-disk relative path using the module path from go.mod, and reports a file-weighted number plus the missing files. It's standard library only, so it runs anywhere via go run, and it doesn't reimplement the per-function table that go tool cover -func already prints. I proved it against a real go test -coverprofile run, not just a synthetic fixture, since the Go toolchain is installed here.
Two findings to flag. Modern go test ./... already lists every module package in the profile at 0% even when untested, so for in-module code the missing-file list is usually empty. The detection earns its keep on build-tagged files and dirs outside ./.... And this is a coverage-only slice of a Go bundle that doesn't otherwise exist yet: there's no go.md rule file, so sync-language-bundle.sh can't fingerprint it (detection keys on a bundle's own .claude/rules). The script installs via make install-lang LANG=go but won't be sync-maintained until the Go bundle gets real rules and a CLAUDE.md. Building that out is the natural companion task.
Tests are black-box: a Go test in its own throwaway module runs the script via go run against temp fixtures and checks output, so the shipped script dir stays test-free. They cover missing-file detection, all-tracked, _test.go exclusion, and the missing-report error. make test gained a go test discovery path for languages/*/tests, guarded so environments without Go skip it cleanly.
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