chore: import upstream snapshot with attribution

scripts/features/lib/classify.mjs

@@ -0,0 +1,93 @@
+/**
+ * Issue classification: quarantine filter + engagement override + skip rules.
+ */
+
+const HARDCODED_BOTS = new Set(["github-actions", "dependabot", "renovate", "claude", "copilot"]);
+
+export function isBot(user) {
+  if (!user) return false;
+  if (user.__typename === "Bot") return true;
+  const login = user.login || "";
+  if (login.endsWith("[bot]")) return true;
+  if (HARDCODED_BOTS.has(login)) return true;
+  return false;
+}
+
+function countThumbs(reactionGroups) {
+  if (!Array.isArray(reactionGroups)) return 0;
+  const g = reactionGroups.find((rg) => rg.content === "THUMBS_UP");
+  return g?.users?.totalCount ?? 0;
+}
+
+function uniqueCommenters(comments, authorLogin) {
+  if (!Array.isArray(comments)) return [];
+  const seen = new Set();
+  for (const c of comments) {
+    const u = c.author;
+    if (!u || !u.login) continue;
+    if (u.login === authorLogin) continue;
+    if (isBot(u)) continue;
+    seen.add(u.login);
+  }
+  return [...seen];
+}
+
+function openLinkedPrs(timelineItems) {
+  if (!Array.isArray(timelineItems)) return [];
+  const result = [];
+  for (const item of timelineItems) {
+    if (item.__typename !== "CrossReferencedEvent") continue;
+    const src = item.source;
+    if (!src || src.__typename !== "PullRequest") continue;
+    if (String(src.state).toLowerCase() !== "open") continue;
+    result.push({ number: src.number, state: "open" });
+  }
+  return result;
+}
+
+export function classifyIssue(issue, thresholds, now = new Date()) {
+  const assignees = issue.assignees ?? [];
+  if (assignees.length > 0) {
+    return {
+      bucket: "skip_assigned",
+      reason: "issue has assignees",
+      assignees: assignees.map((a) => a.login),
+    };
+  }
+
+  const linkedPrs = openLinkedPrs(issue.timelineItems);
+  if (linkedPrs.length > 0) {
+    return {
+      bucket: "skip_has_pr",
+      reason: "issue has open linked PR",
+      linkedPrs,
+    };
+  }
+
+  const createdAt = new Date(issue.createdAt).getTime();
+  let ageDays = Math.floor((now.getTime() - createdAt) / 86400_000);
+  if (ageDays < 0) ageDays = 0;
+
+  const thumbs = countThumbs(issue.reactionGroups);
+  const commenterLogins = uniqueCommenters(issue.comments, issue.author?.login);
+  const commenters = commenterLogins.length;
+
+  const meta = { ageDays, thumbs, commenters };
+
+  if (ageDays >= thresholds.quarantineDays) {
+    return { bucket: "absorb", reason: `age>=${thresholds.quarantineDays}`, ...meta };
+  }
+
+  const overrides = [];
+  if (thumbs >= thresholds.overrideThumbs) overrides.push("thumbs");
+  if (commenters >= thresholds.overrideCommenters) overrides.push("commenters");
+  if (overrides.length > 0) {
+    return { bucket: "absorb", reason: `override:${overrides.join("+")}`, ...meta };
+  }
+
+  return {
+    bucket: "dormant",
+    reason: `age<${thresholds.quarantineDays} && thumbs<${thresholds.overrideThumbs} && commenters<${thresholds.overrideCommenters}`,
+    ...meta,
+  };
+}