Content inspection and archive walks on seeding nodes (relay)

Inspection is split into prepare (database), probe (lib/content/probe:
downloads, decoding and parsing, no database) and apply (database).
worker:collection runs all three; seed:node with SEED_INSPECTORS leases
jobs from the same queues through the seed API (BullMQ manual leases),
fetches articles through the seed API and posts the probes back.

A node now needs only SEED_URL and SEED_TOKEN: the settings the app
requires but a node never uses get placeholders for seed:node.

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

app/services/Par2Service.ts

@@ -1,15 +1,10 @@
 import db from '@adonisjs/lucid/services/db'
-import type { Segment } from '#lib/nzb/index'
 import logger from '@adonisjs/core/services/logger'
-import NntpService from '#services/NntpService'
 import IngestService, { PAR2_MATCH_WINDOW_SECONDS } from '#services/IngestService'
-import { decodeSegment, YencFile } from '#lib/yenc/index'
-import { isPar2, parsePar2, type Par2Set } from '#lib/par2/index'
+import type { Par2Set } from '#lib/par2/index'
 import { par2ReleaseIdentity, par2ReleaseName } from '#lib/release/index'
 import NameService, { WEAK_RELEASE_SQL, isBetterName } from '#services/NameService'
 
-/** Par2 index files are small; recovery volumes can be large and are not needed. */
-const MAX_PARTS = 20
 /** Size-only matching below this is too ambiguous. */
 const SIZE_ONLY_MIN = 1024 * 1024
 
@@ -32,34 +27,6 @@ export interface Par2Result {
  * body-derived binaries carry their exact size. See CONCEPT.md (D16).
  */
 class Par2Service {
-  /**
-   * Reads a par2 file whose first segment is already decoded, downloading the
-   * remaining parts if there are any. Returns null when it is not par2.
-   */
-  async read(first: Buffer, segments: Segment[]): Promise<Par2Set | null> {
-    if (!isPar2(first)) return null
-    const ids = segments.map((part) => part.id)
-    if (ids.length > MAX_PARTS) return null
-    if (ids.length === 1) return parsePar2(first)
-
-    let assembled: YencFile | undefined
-    const conn = await NntpService.acquire()
-    let failed = false
-    try {
-      for (const id of ids) {
-        const segment = decodeSegment(await NntpService.fetchBody(conn, id))
-        assembled ??= YencFile.fromSegment(segment)
-        assembled.add(segment)
-      }
-    } catch (error) {
-      failed = true
-      throw error
-    } finally {
-      NntpService.release(conn, failed)
-    }
-    return parsePar2(assembled!.getBuffer())
-  }
-
   async attach(binary: any, set: Par2Set): Promise<Par2Result> {
     const result = await db.transaction(async (trx) => {
       // Exact: size and first-16-KiB MD5 of a listed file. Only these may pull