Seed relay fetches plain overviews by default

For 2026 a.b.ath articles Eweka's gzip replies have a long tail (p90 12.4 s
per 20k vs 3.9 s plain; 6.1k vs 10.5k headers/s). SEED_NNTP_COMPRESS turns
compression back on; plain replies are deflated for nodes asynchronously.

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

tests/unit/seed_fetch_pool.spec.ts

@@ -26,7 +26,9 @@ test.group('SeedFetchPool', () => {
       })
     })
     await new Promise<void>((resolve) => server.listen(0, '127.0.0.1', resolve))
-    const saved = { host: nntpConfig.host, port: nntpConfig.port, secure: nntpConfig.secure, connections: indexerConfig.seed.nntpConnections }
+    const saved = { host: nntpConfig.host, port: nntpConfig.port, secure: nntpConfig.secure, connections: indexerConfig.seed.nntpConnections, compress: indexerConfig.seed.nntpCompress }
+    // The fallback from a compressed pooled connection (SEED_NNTP_COMPRESS on).
+    indexerConfig.seed.nntpCompress = true
     Object.assign(nntpConfig, { host: '127.0.0.1', port: (server.address() as net.AddressInfo).port, secure: false })
     indexerConfig.seed.nntpConnections = 2
     try {
@@ -39,6 +41,7 @@ test.group('SeedFetchPool', () => {
       SeedFetchPool.closeIdle()
       Object.assign(nntpConfig, { host: saved.host, port: saved.port, secure: saved.secure })
       indexerConfig.seed.nntpConnections = saved.connections
+      indexerConfig.seed.nntpCompress = saved.compress
       server.close()
     }
   })