🐛 [scanner] fix: document catch-binding convention to prevent lint regressions

web/eslint.config.js

@@ -28,6 +28,11 @@ export default tseslint.config(
         'warn',
         { allowConstantExport: true },
       ],
+      // When you don't need the error value, use `catch { }` (no binding).
+      // Using a named binding like `catch (err)` when err is never referenced
+      // is flagged as a new baseline violation and will block the nightly
+      // release (see issues #21352/#21353). Prefix with _ (e.g. `catch (_err)`)
+      // only when you need the type annotation but not the value.
       '@typescript-eslint/no-unused-vars': ['warn', {
         argsIgnorePattern: '^_',
         varsIgnorePattern: '^_',

web/scripts/lint-baseline-check.mjs

@@ -113,6 +113,8 @@ if (newEntries.length > 0) {
     }
   });
   console.log('\n❌ CI fails on new violations. Fix them or update baseline after review.');
+  console.log('   Tip: For unused catch bindings (no-unused-vars), use `catch { }` instead');
+  console.log('   of `catch (err)` when you don\'t need the error value. See eslint.config.js.');
   process.exit(1);
 }