fix(examples,flow-lint): all example flows lint-clean of errors

- flow-lint: strip comments before the payload:null check so a comment that
  merely mentions `{ payload: null }` no longer false-positives (this was the
  only "error" on MGC 02-Dashboard; its fan-out is actually correct).
- Bump monster, rotatingMachine, coresync, machineGroupControl — ui-chart
  required-property + numeric width/height fixes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tools/flow-lint/bin/flow-lint.js

@@ -185,7 +185,13 @@ function checkFunctionFanOut(n, findings) {
       msg: `function "${n.name || n.id}" declares outputs=${outputs} but wires has ${Array.isArray(n.wires) ? n.wires.length : 'no'} arrays.`,
     });
   }
-  if (typeof n.func === 'string' && /payload\s*:\s*null\b/.test(n.func)) {
+  // Strip comments first — a comment that merely *mentions* `{ payload: null }`
+  // (e.g. explaining why the code avoids it) must not trip the rule. Heuristic,
+  // not a full parser, but it kills the common false positive.
+  const funcCode = typeof n.func === 'string'
+    ? n.func.replace(/\/\*[\s\S]*?\*\//g, '').replace(/\/\/[^\n]*/g, '')
+    : '';
+  if (/payload\s*:\s*null\b/.test(funcCode)) {
     findings.push({
       rule: 'FN_PAYLOAD_NULL_LITERAL',
       severity: 'error',