feat(install-lang): seed a neutral CLAUDE.md when a bundle ships none

install-lang only seeded CLAUDE.md if the chosen bundle shipped one. elisp and go do, python and typescript don't. A project installing a template-less bundle got no CLAUDE.md, and a multi-bundle install inherited whichever bundle shipped one. A bash project that installed elisp and python ended up headed "Elisp project," worse than no header.

I added a language-neutral default (languages/default-CLAUDE.md) that names no language, so single-language, multi-bundle, and wrong-bundle installs all get an accurate "fill this in" header instead of a false one. Per-bundle templates still win where present. The seed-on-first-install, no-overwrite logic is unchanged.

I hardened the Makefile LANGUAGES glob to directories only so the new template file doesn't show up as a selectable language. lint covers the default. The install-lang tests cover the fallback, the bundle-wins branch, and no-overwrite.

A bash bundle is still the real gap for shell-heavy projects, filed as a backlog task.

1 files changed, 29 insertions, 0 deletions

diff --git a/scripts/tests/install-lang.bats b/scripts/tests/install-lang.bats
index ecfbe01..f790fbf 100644
--- a/scripts/tests/install-lang.bats
+++ b/scripts/tests/install-lang.bats
@@ -79,6 +79,35 @@ teardown() {
   grep -qxF "coverage/" "$PROJECT/.gitignore"
 }
 
+@test "install-lang python: seeds the language-neutral default CLAUDE.md when the bundle ships none" {
+  run bash "$INSTALL_LANG" python "$PROJECT"
+
+  [ "$status" -eq 0 ]
+  [ -f "$PROJECT/CLAUDE.md" ]
+  # The default names no language, so it can't mislabel a python (or bash, or
+  # multi-bundle) project the way inheriting elisp's "Elisp project" header did.
+  ! grep -qi "Python project" "$PROJECT/CLAUDE.md"
+  ! grep -qi "Elisp project" "$PROJECT/CLAUDE.md"
+  grep -qF "names no language" "$PROJECT/CLAUDE.md"
+  [[ "$output" == *"language-neutral default"* ]]
+}
+
+@test "install-lang elisp: seeds the bundle's own CLAUDE.md, not the default" {
+  run bash "$INSTALL_LANG" elisp "$PROJECT"
+
+  [ "$status" -eq 0 ]
+  grep -qF "Elisp project." "$PROJECT/CLAUDE.md"
+  [[ "$output" == *"CLAUDE.md installed (elisp)"* ]]
+}
+
+@test "install-lang python: does not overwrite an existing CLAUDE.md without FORCE" {
+  echo "MY OWN CLAUDE" > "$PROJECT/CLAUDE.md"
+  run bash "$INSTALL_LANG" python "$PROJECT"
+
+  [ "$status" -eq 0 ]
+  grep -qxF "MY OWN CLAUDE" "$PROJECT/CLAUDE.md"
+}
+
 @test "install-lang go: full bundle lands (rules, hook, settings, githook, CLAUDE.md, coverage)" {
   run bash "$INSTALL_LANG" go "$PROJECT"