feat(languages): add bash/shell bundle

Shell-heavy projects had no bundle that fit. archangel and archsetup are bash repos, and installing elisp or python gave them the wrong language rules. I added languages/bash on the go bundle's shape.

The bundle ships bash.md and bash-testing.md rules, a PostToolUse hook that runs shellcheck on edited shell files and blocks on a violation, a shellcheck pre-commit githook, settings.json wiring, gitignore-add.txt, and a "Bash/shell project" CLAUDE.md. The hook covers .sh, .bash, and extensionless files with a shell shebang, since the CLI tools that fill a shell repo carry no extension. shellcheck is the gate. shfmt stays out of the blocking path because shell has no canonical formatting style, and forcing tabs-vs-spaces would impose a contested choice. Both the hook and the githook are shellcheck-clean against their own rule.

I extended the Makefile test target to discover languages/*/tests/*.bats, so the bundle's 8 hook tests run with the rest of the suite. The README bundle table was stale, listing elisp only. I corrected it to the five bundles now shipping.

1 files changed, 4 insertions, 1 deletions

diff --git a/todo.org b/todo.org
index c1b76b0..4418afa 100644
--- a/todo.org
+++ b/todo.org
@@ -34,10 +34,13 @@ Tags are assigned and refreshed by =task-audit=; =task-review= keeps them honest
 
 * Rulesets Open Work
 
-** TODO [#C] Bash/shell language bundle :feature:
+** DONE [#C] Bash/shell language bundle :feature:
+CLOSED: [2026-06-23 Tue]
 :PROPERTIES:
 :CREATED: [2026-06-23 Tue]
 :END:
+Built =languages/bash/= the same session it was filed: bash.md + bash-testing.md rules, a shellcheck PostToolUse validate hook (covers =.sh=, =.bash=, and extensionless shell scripts by shebang; 8 bats tests), a shellcheck pre-commit githook, settings.json wiring, gitignore-add.txt, and a "Bash/shell project" CLAUDE.md. shfmt left out of the blocking path on purpose (shell has no canonical style). Makefile test target now discovers =languages/*/tests/*.bats=.
+
 No =languages/= bundle fits a shell-heavy project. archangel (437 =.sh= files) and archsetup are bash projects with nothing that matches; installing elisp/python gives them the wrong language rules. Build a =languages/bash/= bundle on the elisp/go pattern: =claude/rules/bash.md= (style — =set -euo pipefail=, quoting, =[[ ]]=, trap/cleanup) + =bash-testing.md= (bats conventions), a PostToolUse validate hook (=shellcheck= on edited =.sh=), a =githooks/pre-commit= running shellcheck on staged shell files, =settings.json= wiring, =gitignore-add.txt=, and its own =CLAUDE.md= headed "Bash/shell project." Urgency dropped 2026-06-23: install-lang now seeds the language-neutral default CLAUDE.md when a bundle ships none, so a bash project no longer gets a mislabeled "Elisp project" header — the bundle is now the accurate-rules win, not a mislabel fix. From archangel 2026-06-23 ([[file:docs/design/2026-06-23-install-lang-claude-md-gap.org][handoff]]).
 
 ** TODO [#B] Anki deck name from #+TITLE :bug: