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/prober.ts

@@ -8,6 +8,7 @@ import { YencError } from '#lib/yenc/index'
 import { inspect, innerName, PROBE_VERSION, type Inspection } from '#lib/probe/index'
 import { NntpShare } from '#services/nntp_shares'
 import { DiskSpace } from '#services/disk_space'
+import { decidePar2Completeness } from '#services/par2_completeness'
 
 interface Candidate {
   id: number
@@ -306,6 +307,8 @@ export class Prober {
         [jsonb(done.map((o) => ({ release_id: o.candidate.releaseId, candidate_id: o.candidate.id, kind: o.candidate.kind, result: { ...o.inspection, par2: undefined } })))]
       )
       await this.storeForMerge(trx, done)
+      // A par2 index read: the release's completeness by its set, when it has no counter.
+      await decidePar2Completeness(trx, [...new Set(done.filter((o) => o.inspection!.par2).map((o) => o.candidate.releaseId))])
       // Each touched release from all its inspections (earlier rounds may have stored others).
       const ids = [...new Set(done.map((o) => o.candidate.releaseId))]
       const { rows } = await trx.rawQuery(