A missing first article is an inspection result, not a failure

Eweka answers 'no such article' after ~450 ms; a quarter of inspection
requests were for missing articles and each failed job was retried up
to three times. Files get content_type 'missing' instead; homelab also
records it from failure reports of nodes not rebuilt yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/content/probe.ts

@@ -83,6 +83,11 @@ export function chunkMd5(data: Buffer, fileSize: number): string | undefined {
   return createHash('md5').update(data.subarray(0, FIRST_CHUNK)).digest('hex')
 }
 
+/** A "no such article" answer: 430 from the news server, 410 from the seed relay. */
+export function isMissingArticle(error: unknown): boolean {
+  return /(^|[^0-9])(430|410)([^0-9]|$)/.test(String((error as any)?.message ?? error)) && !/timed out|no answer/i.test(String((error as any)?.message))
+}
+
 /** Decodes a body; some tools declare a size that leaves out a header (nzbe), the CRC still has to match. */
 export function decodeBody(body: Buffer): DecodedSegment {
   try {
@@ -132,7 +137,17 @@ export async function probeInspection(
   fetch: BodyFetcher,
   warn: (message: string) => void = () => {}
 ): Promise<InspectProbe> {
-  const segment = decodeBody(await fetch(task.segments[0].id))
+  let body: Buffer
+  try {
+    body = await fetch(task.segments[0].id)
+  } catch (error: any) {
+    // The server no longer has it (430; 410 through the seed relay), typically a takedown. A final
+    // answer, and an expensive one: Eweka takes ~450 ms per missing article, so it isn't retried
+    // (LOG.md 2026-10-06 (14)).
+    if (isMissingArticle(error)) return { size: 0, contentType: 'missing', md5_16k: null, yencName: '' }
+    throw error
+  }
+  const segment = decodeBody(body)
   const size = segment.meta.begin.size
   const contentType = sniffContentType(segment.data)
   const probe: InspectProbe = {