Decide completeness by par2 set for releases without a counter

59% of settled releases had complete = NULL: without an [i/N] counter
the settler left it unknown, and the "phase 2 reads par2 sets for those"
step was never built. A release is now complete when every file its par2
sets describe is there by name or by its first-16-KiB hash, or, for an
upload renamed after its par2 was made, when it has as many non-par2
files and bytes. Decided when a par2 index is probed, after a par2 merge,
and before the pruner drops a set's file list; the batch store, settler
and merger keep a decided value instead of resetting it to NULL.
releases:par2-complete decides the releases probed before this.

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

app/services/settler.ts

@@ -15,7 +15,8 @@ const BATCH = 50_000
  * Settles releases (REBUILD.md, part 8): once nothing has been added for
  * QUIET_HOURS (QUIET_HISTORY_MINUTES once its last post is that old), its completeness is decided: complete when every file the
  * [i/N] counter announced was found, unknown without a counter (phase 2
- * reads par2 sets for those). Phase 2 picks its work from settled releases.
+ * decides those by their par2 sets: app/services/par2_completeness.ts).
+ * Phase 2 picks its work from settled releases.
  */
 class Settler {
   /** Up to `batches` batches of BATCH (all there are without). */
@@ -25,7 +26,7 @@ class Settler {
       // Their probe candidates become claimable (Prober.claim), the unreadable ones first.
       const { rows } = await db.rawQuery(
         `WITH settled AS (
-           UPDATE releases SET settled_at = now(), complete = CASE WHEN file_total IS NULL THEN NULL ELSE files >= file_total END
+           UPDATE releases SET settled_at = now(), complete = CASE WHEN file_total IS NULL THEN complete ELSE files >= file_total END
            WHERE id IN (SELECT id FROM releases WHERE settled_at IS NULL AND last_seen_at < now() - make_interval(mins => ?)
              AND (last_seen_at < now() - make_interval(hours => ?) OR coalesce(last_posted_at, posted_at) < now() - make_interval(hours => ?)) LIMIT ?)
            RETURNING id, readable, files, bytes, poster, sidecar_only),