Albums in the Rust edge, and the batch-counter rule (design 3)

A release the window closed on with one file named by its stem or post, the
name with a number and no archive, volume, sidecar or random name, waits in
the album of its poster and template (the name's digit runs as #, the
extension apart) posted within the window of the album's first file; the
album closes a window after that span and is written as one release
(source album, no file total) named by the members' shared numbers, a lone
member as the release it was. The batch store writes an album's member
names as release_texts kind 6 (member). A counter total of 100 or more under
which one poster started 20 or more releases is a batch counter: those
releases get no file total.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

lib/release/text_kind.ts

@@ -15,6 +15,8 @@ export const TEXT_KINDS = {
   par2: 4,
   /** A title from a media container's metadata. */
   media: 5,
+  /** An album's member, by its own file name (the edge's albums: one poster's files differing by a number sequence). */
+  member: 6,
 } as const
 
 export type TextKind = keyof typeof TEXT_KINDS