enforce: 777-line hard limit on JS files — CI gate + pre-commit hook

app.js is a THIN WRAPPER. No file over 777 lines.
Current app.js is 2214 lines — must be broken up before any new features merge.

CI will block PRs that violate this. Pre-commit hook catches it locally.
Install hook: git config core.hooksPath .githooks

.githooks/pre-commit

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Pre-commit hook: enforce 777-line limit on JS files
+# Install: git config core.hooksPath .githooks
+
+FAIL=0
+for f in $(git diff --cached --name-only --diff-filter=ACM | grep '\.js$' | grep -v node_modules | grep -v tests/); do
+  LINES=$(wc -l < "$f" | tr -d ' ')
+  if [ "$LINES" -gt 777 ]; then
+    echo "BLOCKED: $f is $LINES lines (max: 777)"
+    echo "  Extract into a module. app.js is a thin wrapper."
+    FAIL=1
+  fi
+done
+
+if [ $FAIL -eq 1 ]; then
+  echo ""
+  echo "No JS file may exceed 777 lines. Break it up."
+  exit 1
+fi