Remove the ai-assisted label when an edit drops the disclosure line

Keeps the label a deterministic mirror of the body's disclosure state,
per Greptile's P2 review finding on #518.

AI-assisted: written with an AI agent under maintainer direction.
Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/github/issue-gate.mjs

@@ -181,6 +181,7 @@ export function evaluateIssue(issue, options = {}) {
   const plan = { ...base, verdict, reasons };
   plan.aiAssisted = AI_DISCLOSURE.test(body);
   if (plan.aiAssisted && !labels.has(AI_LABEL)) plan.labelsToAdd.push(AI_LABEL);
+  if (!plan.aiAssisted && labels.has(AI_LABEL)) plan.labelsToRemove.push(AI_LABEL);
 
   if (verdict === 'pass') {
     if (labels.has(GATE_LABEL)) plan.labelsToRemove.push(GATE_LABEL);

tests/github-issue-gate.test.mjs

@@ -222,6 +222,15 @@ describe('issue body gate', () => {
     assert.deepEqual(plan.labelsToAdd, [AI_LABEL]);
   });
 
+  it('removes the AI label when an edit drops the disclosure line', () => {
+    const plan = evaluateIssue(issue({
+      labels: [AI_LABEL],
+    }), { templates });
+    assert.equal(plan.verdict, 'pass');
+    assert.equal(plan.aiAssisted, false);
+    assert.deepEqual(plan.labelsToRemove, [AI_LABEL]);
+  });
+
   it('exempts maintainers and repo members', () => {
     const maintainer = evaluateIssue(issue({ authorLogin: 'pbakaus', body: 'quick note' }), { templates });
     assert.equal(maintainer.exempt, true);