fix(elisp): gitignore the full Claude tooling footprint

The bundle tracked .claude/rules, CLAUDE.md, and githooks/, ignoring only the personal overrides. For a code project, especially a third-party package checkout, the whole Claude footprint should stay local: install and sync deliver it, so it shouldn't land in the project's history. gitignore-add.txt now ignores .claude/, CLAUDE.md, and githooks/ next to the elisp build artifacts.

I also added install-lang.bats, which the bundle had no test for. It covers the landed footprint and the gitignore set.

1 files changed, 42 insertions, 0 deletions

diff --git a/scripts/tests/install-lang.bats b/scripts/tests/install-lang.bats
new file mode 100644
index 0000000..523be99
--- /dev/null
+++ b/scripts/tests/install-lang.bats
@@ -0,0 +1,42 @@
+#!/usr/bin/env bats
+#
+# Tests for scripts/install-lang.sh — install a language ruleset into a project.
+#
+# Strategy: scaffold a fresh git project in a temp dir, run install-lang.sh
+# against it. Canonical source stays the real one (install-lang.sh resolves
+# languages/ and claude-rules/ relative to its own location).
+
+REAL_REPO="$(cd "$(dirname "$BATS_TEST_FILENAME")/../.." && pwd)"
+INSTALL_LANG="$REAL_REPO/scripts/install-lang.sh"
+
+setup() {
+  PROJECT="$(mktemp -d -t install-lang-bats.XXXXXX)"
+  (cd "$PROJECT" && git init -q)
+}
+
+teardown() {
+  rm -rf "$PROJECT"
+}
+
+@test "install-lang elisp: lands the tooling footprint" {
+  run bash "$INSTALL_LANG" elisp "$PROJECT"
+
+  [ "$status" -eq 0 ]
+  [ -d "$PROJECT/.claude/rules" ]
+  [ -d "$PROJECT/githooks" ]
+  [ -f "$PROJECT/CLAUDE.md" ]
+}
+
+@test "install-lang elisp: gitignores the full Claude tooling footprint" {
+  run bash "$INSTALL_LANG" elisp "$PROJECT"
+
+  [ "$status" -eq 0 ]
+  # The whole .claude/, CLAUDE.md, and githooks/ stay out of the project's
+  # git history — Claude tooling is delivered by install/sync, never committed.
+  grep -qxF ".claude/" "$PROJECT/.gitignore"
+  grep -qxF "CLAUDE.md" "$PROJECT/.gitignore"
+  grep -qxF "githooks/" "$PROJECT/.gitignore"
+  # Elisp byte-compile artifacts.
+  grep -qxF "*.elc" "$PROJECT/.gitignore"
+  grep -qxF "*.eln" "$PROJECT/.gitignore"
+}