feat(triage): add CHANGELOG parser for delivery detection

scripts/features/lib/delivered.mjs

@@ -0,0 +1,33 @@
+/**
+ * Delivery detection: PR merged + CHANGELOG + git log, with confidence grading.
+ */
+
+const VERSION_HEADER_RE = /^##\s+\[?(\d+\.\d+\.\d+)\]?/;
+
+export function parseChangelog(text, issueNumber) {
+  if (typeof text !== "string") return null;
+  const needle = `#${issueNumber}`;
+  const lines = text.split("\n");
+
+  let currentSection = null;
+  let currentVersion = null;
+  for (const line of lines) {
+    const headerMatch = line.match(VERSION_HEADER_RE);
+    if (headerMatch) {
+      currentSection = line.trim();
+      currentVersion = headerMatch[1];
+      continue;
+    }
+    if (line.includes(needle) && currentSection) {
+      const match = line.match(/\(#\d+\)/);
+      if (match && match[0] === `(${needle})`) {
+        return {
+          section: currentSection,
+          version: currentVersion,
+          line: line.trim(),
+        };
+      }
+    }
+  }
+  return null;
+}