Seed relay: compressed overviews by default again

Measured with 20 relay connections, plain and gzip both gave ~1.5 chunks/s
for 2026 a.b.ath articles; plain used many times the CPU and traffic.

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

config/indexer.ts

@@ -73,11 +73,12 @@ export default {
      */
     nntpTimeoutMs: env.get('SEED_NNTP_TIMEOUT_MS', 90 * 1000),
     /**
-     * Ask the news server for gzip-compressed overviews. Off: for 2026 articles Eweka's
-     * compressed replies have a long tail (p90 12.4 s per 20k, against 3.9 s plain; 6.1k
-     * against 10.5k headers/s, LOG.md 2026-10-06 (9)). Nodes get gzip from the relay either way.
+     * Ask the news server for gzip-compressed overviews (SEED_NNTP_COMPRESS=false: plain).
+     * On one connection plain had a shorter tail for 2026 articles, but with 20 relay
+     * connections both gave ~1.5 chunks/s, plain at many times the relay's CPU and
+     * more traffic (LOG.md 2026-10-06 (9)).
      */
-    nntpCompress: env.get('SEED_NNTP_COMPRESS', false),
+    nntpCompress: env.get('SEED_NNTP_COMPRESS', true),
   },
 
   backfill: {