Rebuild: completeness as indexed, file totals from any counter, pausable tails, progress by articles

- releases.complete is computed with every batch (files >= the
  counter's total) instead of only when a release settles after 6 quiet
  hours: the 'complete' filter matched nothing in a fresh catalog.
- A release's file total comes from any counter form (counterTotal:
  '(01/10)', 'File 27 of 132', …), not only [i/M]; the post rule's key
  keeps the [i/M] total, so keys are unchanged. Both implementations.
- groups.tail: a group's live tail can be paused (its history and owner
  priority stay), e.g. to let other groups' history go first.
- Stats: history by articles, and the current pass (history ranges
  before those deferred 2000 priorities behind) as its own figure; the
  header showed 0.1% of ranges counting 145k deferred ones.

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

lib/release/identity.ts

@@ -185,7 +185,9 @@ export function isPosterTag(remainder: string, stem: string): boolean {
  */
 export function releaseIdentity(input: ReleaseInput): ReleaseIdentity | null {
   const counter = /\[(\d+)\/(\d+)\]/.exec(input.subject)
-  const fileTotal = counter ? Number.parseInt(counter[2], 10) : undefined
+  // The post rule's key takes the [i/M] total (as when the catalog started); the release's file total any counter's.
+  const postTotal = counter ? Number.parseInt(counter[2], 10) : undefined
+  const fileTotal = counterTotal(input.subject)
   const stem = fileStem(input.name)
 
   if (input.weak) {
@@ -223,8 +225,8 @@ export function releaseIdentity(input: ReleaseInput): ReleaseIdentity | null {
   }
   // Not a name, but a post id (e.g. `83110629-n [10/18] - "random"`): with the
   // [i/M] counter it groups the files of one post whose names are random.
-  if (!tag && fileTotal && isPostToken(remainder)) {
-    return { key: hash('post', input.poster, remainder, fileTotal), name: remainder, fileTotal, source: 'post' }
+  if (!tag && postTotal && isPostToken(remainder)) {
+    return { key: hash('post', input.poster, remainder, postTotal), name: remainder, fileTotal, source: 'post' }
   }
   // An image without words around it: its set by its name (keyed as a stem, so "x.jpg" joins "x.part01.rar").
   if (image) return { key: hash('stem', input.poster, prefix || stem), name: prefix || stem, fileTotal, source: 'stem' }