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, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 294e99c..ca73612 100644
--- a/Makefile
+++ b/Makefile
@@ -509,7 +509,7 @@ test: ## Run all test suites (pytest + ERT + bats)
 		echo "ert: $$(basename "$$f")"; \
 		emacs --batch -q -l ert -l "$$f" -f ert-run-tests-batch-and-exit; \
 	done
-	@set -e; for f in scripts/tests/*.bats .ai/scripts/tests/*.bats; do \
+	@set -e; for f in scripts/tests/*.bats .ai/scripts/tests/*.bats languages/*/tests/*.bats; do \
 		[ -e "$$f" ] || continue; \
 		echo "bats: $$(basename "$$f")"; \
 		bats "$$f"; \