Keep binaries until inspected; seeding writes binaries only for inspection

Par2 naming needs the fingerprint inspection stores on a binary, and the
GC deleted seeded binaries (6 h unfingerprinted, 48 h stale) long before
the inspection queue reached them. binaries.awaiting_inspection protects
them for up to 7 days; the GC deletes use partial indexes so they don't
read past waiting rows. Seeding no longer creates binaries for files that
aren't inspected (~85% of a.b.ath), which only churned the table.

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

config/gc.ts

@@ -46,6 +46,11 @@ export default {
      * later, so they go sooner than staleAfterSeconds.
      */
     unfingerprintedAfterSeconds: env.get('GC_UNFINGERPRINTED_SECONDS', 6 * 60 * 60),
+    /**
+     * A finished binary whose file waits for content inspection is kept this long at
+     * most (it needs the fingerprint inspection stores for par2 naming, D16).
+     */
+    awaitInspectionSeconds: env.get('GC_AWAIT_INSPECTION_SECONDS', 7 * 24 * 60 * 60),
   },
 
   /**