Fix issues being auto-closed despite human activity (#26360)

The sweep script was closing issues based solely on when a lifecycle label
was applied, ignoring any human comments posted after the label. This caused
active issues (like #11792) to be closed even when users responded to the
stale warning.

Three changes:

1. Teach the triage bot about `stale` and `autoclose` labels so it removes
   them when a human comments on the issue.

2. Add a safety net in `closeExpired()` that checks for non-bot comments
   posted after the lifecycle label was applied — if any exist, skip closing.

3. Extend the 10-upvote protection (which previously only applied to
   enhancements) to all issue types, in both `markStale()` and
   `closeExpired()`.

Fixes #16497

## Test plan

Trace through scenarios manually:
- Issue with stale label + human comment after → triage removes label;
  sweep skips even if triage hasn't run yet (safety net)
- Issue with stale label + no human comment → closes as before
- Issue with 10+ upvotes of any type → never marked stale or closed

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/sweep.ts

@@ -70,11 +70,8 @@ async function markStale(owner: string, repo: string) {
       );
       if (alreadyStale) continue;
 
-      const isEnhancement = issue.labels?.some(
-        (l: any) => l.name === "enhancement"
-      );
       const thumbsUp = issue.reactions?.["+1"] ?? 0;
-      if (isEnhancement && thumbsUp >= STALE_UPVOTE_THRESHOLD) continue;
+      if (thumbsUp >= STALE_UPVOTE_THRESHOLD) continue;
 
       const base = `/repos/${owner}/${repo}/issues/${issue.number}`;
 
@@ -109,6 +106,10 @@ async function closeExpired(owner: string, repo: string) {
       for (const issue of issues) {
         if (issue.pull_request) continue;
         if (issue.locked) continue;
+
+        const thumbsUp = issue.reactions?.["+1"] ?? 0;
+        if (thumbsUp >= STALE_UPVOTE_THRESHOLD) continue;
+
         const base = `/repos/${owner}/${repo}/issues/${issue.number}`;
 
         const events = await githubRequest<any[]>(`${base}/events?per_page=100`);
@@ -120,6 +121,22 @@ async function closeExpired(owner: string, repo: string) {
 
         if (!labeledAt || labeledAt > cutoff) continue;
 
+        // Skip if a non-bot user commented after the label was applied.
+        // The triage workflow should remove lifecycle labels on human
+        // activity, but check here too as a safety net.
+        const comments = await githubRequest<any[]>(
+          `${base}/comments?since=${labeledAt.toISOString()}&per_page=100`
+        );
+        const hasHumanComment = comments.some(
+          (c) => c.user && c.user.type !== "Bot"
+        );
+        if (hasHumanComment) {
+          console.log(
+            `#${issue.number}: skipping (human activity after ${label} label)`
+          );
+          continue;
+        }
+
         if (DRY_RUN) {
           const age = Math.floor((Date.now() - labeledAt.getTime()) / 86400000);
           console.log(`#${issue.number}: would close (${label}, ${age}d old) — ${issue.title}`);