Complete Commonlib rc.6 integration and setup workflows

test/fixtures/p2p-relay/compose.yml

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+services:
+  p2p-relay:
+    image: ghcr.io/hoytech/strfry:latest
+    container_name: livesync-e2e-p2p-relay
+    entrypoint: ["/app/strfry"]
+    command: ["--config", "/etc/strfry/strfry.conf", "relay"]
+    ports:
+      - "${E2E_P2P_RELAY_PORT:-4010}:7777"
+    volumes:
+      - ./strfry.conf:/etc/strfry/strfry.conf:ro
+    tmpfs:
+      - /app/strfry-db:rw,size=256m,mode=1777

test/fixtures/p2p-relay/strfry.conf

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+db = "./strfry-db/"
+
+relay {
+  bind = "0.0.0.0"
+  port = 7777
+  nofiles = 100000
+
+  info {
+    name = "Self-hosted LiveSync E2E relay"
+    description = "Local Nostr signalling fixture for real-Obsidian P2P tests"
+  }
+
+  maxWebsocketPayloadSize = 131072
+  autoPingSeconds = 55
+
+  writePolicy {
+    plugin = ""
+  }
+}