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>

start/env.ts

@@ -83,6 +83,7 @@ export default await Env.create(new URL('../', import.meta.url), {
   NNTP_TLS_SERVERNAME: Env.schema.string.optional(),
   SEED_NNTP_CONNECTIONS: Env.schema.number.optional(),
   SEED_NNTP_TIMEOUT_MS: Env.schema.number.optional(),
+  SEED_NNTP_COMPRESS: Env.schema.boolean.optional(),
 
   // Indexer (config/indexer.ts)
   BACKFILL_MAX_QUEUED: Env.schema.number.optional(),