0.6.7: Drop slskd from the digest health check

slskd is not part of the pipeline -- sldl is its own Soulseek client and
nothing in alembic calls slskd's API; the digest's reachability ping was its
only mention. It keeps running on the host purely as the user's own
file-sharing presence, so checking it here just risked a permanent bogus
warning line for something alembic doesn't depend on.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pipeline/lib/pipeline-status.sh

@@ -18,8 +18,10 @@
 # swallow the whole message.
 #
 # Reports on:
-#   - Sibling service reachability (slskd, navidrome) via HTTP, not docker ps —
-#     alembic has no Docker socket access
+#   - Sibling service reachability (navidrome) via HTTP, not docker ps —
+#     alembic has no Docker socket access. slskd is deliberately NOT checked:
+#     it is not part of the pipeline (sldl is its own Soulseek client) — it
+#     runs on the host purely as the user's own file-sharing presence.
 #   - Today's runs: playlist syncs, Bandcamp sync, manual imports, dedup
 #   - Weekly maintenance freshness: strip-mb-tags, strip-watermark-art,
 #     scrub-watermark-text, clean-sldl-index, spotify-genre
@@ -188,7 +190,6 @@ dedup_today_status() {
       mark_warn "$name" "unreachable at $url"
     fi
   }
-  check_http slskd     "http://gluetun:5030/"
   check_http navidrome "http://navidrome:4533/rest/ping.view"
 
   # 2. Today's runs