fix CI paths for monorepo lang/ layout; add pre-commit hook

.githooks/pre-commit

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# El pre-commit hook: compile and run native tests before commit.
+# Install once per clone: git config core.hooksPath .githooks
+
+set -euo pipefail
+
+ROOT="$(git rev-parse --show-toplevel)"
+LANG_DIR="$ROOT/lang"
+RUNTIME="$LANG_DIR/el-compiler/runtime"
+ELC="$LANG_DIR/dist/platform/elc"
+
+# If elc isn't built yet, skip with a warning rather than blocking
+if [ ! -x "$ELC" ]; then
+  echo "⚠  elc not found at lang/dist/platform/elc — skipping pre-commit tests"
+  echo "   Build it first: cd lang && gcc -O2 -I el-compiler/runtime dist/elc-bootstrap.c el-compiler/runtime/el_runtime.c -lcurl -lpthread -o dist/elc-gen2 && ./dist/elc-gen2 el-compiler/src/compiler.el > /tmp/elc.c && gcc -O2 -I el-compiler/runtime /tmp/elc.c el-compiler/runtime/el_runtime.c -lcurl -lpthread -o dist/platform/elc"
+  exit 0
+fi
+
+echo "→ Running El native tests..."
+PASS=0
+FAIL=0
+FAILED_TESTS=""
+
+for test_file in "$LANG_DIR"/tests/native/test_*.el; do
+  name=$(basename "$test_file" .el)
+  tmp_c="/tmp/el_hook_${name}.c"
+  tmp_bin="/tmp/el_hook_${name}"
+
+  if "$ELC" --test "$test_file" > "$tmp_c" 2>/dev/null \
+     && gcc -O2 -I "$RUNTIME" "$tmp_c" "$RUNTIME/el_runtime.c" \
+          -lcurl -lpthread -lm -o "$tmp_bin" 2>/dev/null \
+     && "$tmp_bin" 2>/dev/null; then
+    PASS=$((PASS + 1))
+  else
+    echo "  ✗ $name"
+    FAIL=$((FAIL + 1))
+    FAILED_TESTS="$FAILED_TESTS $name"
+  fi
+done
+
+echo "  $PASS passed, $FAIL failed"
+
+if [ "$FAIL" -gt 0 ]; then
+  echo ""
+  echo "✗ Pre-commit failed. Fix these tests before committing:$FAILED_TESTS"
+  exit 1
+fi
+
+echo "✓ All tests passed"
+exit 0