feat: add per-project language bundles + elisp ruleset

Introduces a second install mode alongside the existing global symlinks:
per-project language bundles that copy a language-specific Claude Code
setup (rules, hooks, settings, pre-commit) into a target project.

Layout additions:
  languages/elisp/       - Emacs Lisp bundle (rules, hooks, settings, CLAUDE.md)
  scripts/install-lang.sh - shared install logic

Makefile additions:
  make help              - unified help text
  make install-lang LANG=<lang> PROJECT=<path> [FORCE=1]
  make install-elisp PROJECT=<path> [FORCE=1]   (shortcut)
  make list-languages    - show available bundles

Elisp bundle contents:
  - CLAUDE.md template (seed on first install, preserved on update)
  - .claude/rules/elisp.md, elisp-testing.md, verification.md
  - .claude/hooks/validate-el.sh (check-parens, byte-compile, run matching tests)
  - .claude/settings.json (permission allowlist, hook wiring)
  - githooks/pre-commit (secret scan + staged-file paren check)
  - gitignore-add.txt (append .claude/settings.local.json)

Hooks use \$CLAUDE_PROJECT_DIR with a script-relative fallback, so the
same bundle works on any machine or clone path. Install activates git
hooks via core.hooksPath=githooks automatically. Re-running install is
idempotent; CLAUDE.md is never overwritten without FORCE=1.

1 files changed, 79 insertions, 0 deletions

diff --git a/languages/elisp/claude/hooks/validate-el.sh b/languages/elisp/claude/hooks/validate-el.sh
new file mode 100644
index 0000000..5fd4241
--- /dev/null
+++ b/languages/elisp/claude/hooks/validate-el.sh
@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+# Validate and test .el files after Edit/Write/MultiEdit.
+# PostToolUse hook: receives tool-call JSON on stdin.
+# Silent on success; on failure, prints emacs output and exits 2
+# so Claude sees the error and can correct it.
+#
+# Phase 1: check-parens + byte-compile
+# Phase 2: for modules/*.el, run matching tests/test-<stem>*.el
+
+set -u
+
+# Portable project root: prefer Claude Code's env var, fall back to deriving
+# from this script's location ($project/.claude/hooks/validate-el.sh).
+PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(cd "$(dirname "$0")/../.." && pwd)}"
+
+f="$(jq -r '.tool_input.file_path // .tool_response.filePath // empty')"
+[ -z "$f" ] && exit 0
+[ "${f##*.}" = "el" ] || exit 0
+
+MAX_AUTO_TEST_FILES=20  # skip if more matches than this (large test suites)
+
+# --- Phase 1: syntax + byte-compile ---
+case "$f" in
+  */init.el|*/early-init.el)
+    # Byte-compile here would load the full package graph. Parens only.
+    if ! output="$(emacs --batch --no-site-file --no-site-lisp "$f" \
+                     --eval '(check-parens)' 2>&1)"; then
+      printf 'PAREN CHECK FAILED: %s\n%s\n' "$f" "$output" >&2
+      exit 2
+    fi
+    ;;
+  *.el)
+    if ! output="$(emacs --batch --no-site-file --no-site-lisp \
+                     -L "$PROJECT_ROOT" \
+                     -L "$PROJECT_ROOT/modules" \
+                     -L "$PROJECT_ROOT/tests" \
+                     "$f" \
+                     --eval '(check-parens)' \
+                     --eval "(or (byte-compile-file \"$f\") (kill-emacs 1))" 2>&1)"; then
+      printf 'VALIDATION FAILED: %s\n%s\n' "$f" "$output" >&2
+      exit 2
+    fi
+    ;;
+esac
+
+# --- Phase 2: test runner ---
+# Determine which tests (if any) apply to this edit.
+tests=()
+case "$f" in
+  "$PROJECT_ROOT/modules/"*.el)
+    stem="$(basename "${f%.el}")"
+    mapfile -t tests < <(find "$PROJECT_ROOT/tests" -maxdepth 1 -name "test-${stem}*.el" 2>/dev/null | sort)
+    ;;
+  "$PROJECT_ROOT/tests/testutil-"*.el)
+    stem="$(basename "${f%.el}")"
+    stem="${stem#testutil-}"
+    mapfile -t tests < <(find "$PROJECT_ROOT/tests" -maxdepth 1 -name "test-${stem}*.el" 2>/dev/null | sort)
+    ;;
+  "$PROJECT_ROOT/tests/test-"*.el)
+    tests=("$f")
+    ;;
+esac
+
+count="${#tests[@]}"
+if [ "$count" -ge 1 ] && [ "$count" -le "$MAX_AUTO_TEST_FILES" ]; then
+  load_args=()
+  for t in "${tests[@]}"; do load_args+=("-l" "$t"); done
+  if ! output="$(emacs --batch --no-site-file --no-site-lisp \
+                   -L "$PROJECT_ROOT" \
+                   -L "$PROJECT_ROOT/modules" \
+                   -L "$PROJECT_ROOT/tests" \
+                   -l ert "${load_args[@]}" \
+                   --eval "(ert-run-tests-batch-and-exit '(not (tag :slow)))" 2>&1)"; then
+    printf 'TESTS FAILED for %s (%d test file(s)):\n%s\n' "$f" "$count" "$output" >&2
+    exit 2
+  fi
+fi
+
+exit 0