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* feat(brief): source links, LLM descriptions, strip publisher suffix (envelope v2) Three coordinated fixes to the magazine content pipeline. 1. Headlines were ending with " - AP News" / " | Reuters" etc. because the composer passed RSS titles through verbatim. Added stripHeadlineSuffix() in brief-compose.mjs, conservative case- insensitive match only when the trailing token equals primarySource, so a real subtitle that happens to contain a dash still survives. 2. Story descriptions were the headline verbatim. Added generateStoryDescription to brief-llm.mjs, plumbed into enrichBriefEnvelopeWithLLM: one additional LLM call per story, cached 24h on a v1 key covering headline, source, severity, category, country. Cache hits are revalidated via parseStoryDescription so a bad row cannot flow to the envelope. Falls through to the cleaned headline on any failure. 3. Source attribution was plain text, no outgoing link. Bumped BRIEF_ENVELOPE_VERSION to 2, added BriefStory.sourceUrl. The composer now plumbs story:track:v1.link through digestStoryToUpstreamTopStory, UpstreamTopStory.primaryLink, filterTopStories, BriefStory.sourceUrl. The renderer wraps the Source line in an anchor with target=_blank, rel=noopener noreferrer, and UTM params (utm_source=worldmonitor, utm_medium=brief, utm_campaign=<issueDate>, utm_content=story- <rank>). UTM appending is idempotent, publisher-attributed URLs keep their own utm_source. Envelope validation gains a validateSourceUrl step (https/http only, no userinfo credentials, parseable absolute URL). Stories without a valid upstream link are dropped by filterTopStories rather than shipping with an unlinked source. Tests: 30 renderer tests to 38; new assertions cover UTM presence on every anchor, HTML-escaping of ampersands in hrefs, pre-existing UTM preservation, and all four validator rejection modes. New composer tests cover suffix stripping, link plumb-through, and v2 drop-on-no- link behaviour. New LLM tests for generateStoryDescription cover cache hit/miss, revalidation of bad rows, 24h TTL, and null-on- failure. * fix(brief): v1 back-compat window on renderer + consolidate story hash helper Two P1/P2 review findings on #3181. P1 (v1 back-compat). Bumping BRIEF_ENVELOPE_VERSION 1 to 2 made every v1 envelope still resident in Redis under the 7-day TTL fail assertBriefEnvelope. The hosted /api/brief route would 404 "expired" and the /api/latest-brief preview would downgrade to "composing", breaking already-issued links from the preceding week. Fix: renderer now accepts SUPPORTED_ENVELOPE_VERSIONS = Set([1, 2]) on READ. BRIEF_ENVELOPE_VERSION stays at 2 and is the only version the composer ever writes. BriefStory.sourceUrl is required when version === 2 and absent on v1; when rendering a v1 story the source line degrades to plain text (no anchor), matching pre-v2 appearance. When the TTL window passes the set can shrink to [2] in a follow-up. P2 (hash dedup). hashStoryDescription was byte-identical to hashStory, inviting silent drift if one prompt gains a field the other forgets. Consolidated into hashBriefStory. Cache key separation remains via the distinct prefixes (brief:llm:whymatters:v2:/brief:llm:description:v1:). Tests: adds 3 v1 back-compat assertions (plain source line, field validation still runs, defensive sourceUrl check), updates the version-mismatch assertion to match the new supported-set message. 161/161 pass (was 158). Full test:data 5706/5706.