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;
+}

tests/unit/feature-triage/delivered.test.mjs

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+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { parseChangelog } from "../../../scripts/features/lib/delivered.mjs";
+
+describe("parseChangelog", () => {
+  it("returns section header when #N found", () => {
+    const text = `
+# Changelog
+
+## [3.7.2] - 2026-03-15
+
+- Fix something (#980)
+- Other item
+
+## [3.7.1] - 2026-03-01
+
+- Earlier change (#900)
+`;
+    const r = parseChangelog(text, 980);
+    assert.deepEqual(r, {
+      section: "## [3.7.2] - 2026-03-15",
+      version: "3.7.2",
+      line: "- Fix something (#980)",
+    });
+  });
+
+  it("returns null when #N not found", () => {
+    const text = `## [3.7.2]\n- Item #100\n`;
+    assert.equal(parseChangelog(text, 999), null);
+  });
+
+  it("ignores #N appearing without # prefix", () => {
+    const text = `## [3.7.2]\n- Issue 980 (no hash)\n`;
+    assert.equal(parseChangelog(text, 980), null);
+  });
+
+  it("handles plain version headers without brackets/date", () => {
+    const text = `## 3.7.2\n- Fix (#980)\n`;
+    const r = parseChangelog(text, 980);
+    assert.equal(r.version, "3.7.2");
+  });
+});