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

.gitea/workflows/ci.yml

@@ -14,15 +14,12 @@ jobs:
 
       - name: Validate HTML
         run: |
-          # Check index.html exists and is valid-ish
           test -f index.html || { echo "ERROR: index.html missing"; exit 1; }
-          # Check for unclosed tags (basic)
           python3 -c "
           import html.parser, sys
           class V(html.parser.HTMLParser):
               def __init__(self):
                   super().__init__()
-                  self.errors = []
               def handle_starttag(self, tag, attrs): pass
               def handle_endtag(self, tag): pass
           v = V()
@@ -36,9 +33,8 @@ jobs:
 
       - name: Validate JavaScript
         run: |
-          # Syntax check all JS files
           FAIL=0
-          for f in $(find . -name '*.js' -not -path './node_modules/*' -not -name 'sw.js'); do
+          for f in $(find . -name '*.js' -not -path './node_modules/*' -not -name 'sw.js' -not -name 'service-worker.js' -not -path './tests/*'); do
             if ! node --check "$f" 2>/dev/null; then
               echo "FAIL: $f"
               FAIL=1
@@ -50,9 +46,8 @@ jobs:
 
       - name: Validate JSON
         run: |
-          # Check all JSON files parse
           FAIL=0
-          for f in $(find . -name '*.json' -not -path './node_modules/*'); do
+          for f in $(find . -name '*.json' -not -path './node_modules/*' -not -path './test-*'); do
             if ! python3 -c "import json; json.load(open('$f'))"; then
               echo "FAIL: $f"
               FAIL=1
@@ -62,9 +57,30 @@ jobs:
           done
           exit $FAIL
 
-      - name: Check file size budget
+      - name: "HARD RULE: No JS file over 777 lines"
+        run: |
+          echo "=== File Size Budget: 777 lines max per JS file ==="
+          FAIL=0
+          for f in $(find . -name '*.js' -not -path './node_modules/*' -not -path './test-*' -not -path './tests/*'); do
+            LINES=$(wc -l < "$f" | tr -d ' ')
+            if [ "$LINES" -gt 777 ]; then
+              echo "FAIL: $f is $LINES lines (max: 777)"
+              FAIL=1
+            else
+              echo "OK: $f ($LINES lines)"
+            fi
+          done
+          if [ $FAIL -eq 1 ]; then
+            echo ""
+            echo "═══════════════════════════════════════════════════"
+            echo "  BLOCKED: No JS file may exceed 777 lines."
+            echo "  Extract into modules. app.js is a THIN WRAPPER."
+            echo "═══════════════════════════════════════════════════"
+          fi
+          exit $FAIL
+
+      - name: Check file size budget (bytes)
         run: |
-          # Performance budget: no single JS file > 500KB
           FAIL=0
           for f in $(find . -name '*.js' -not -path './node_modules/*'); do
             SIZE=$(wc -c < "$f")