Initial commit: watch-together phases 0-4 + presence hardening, internet-tested

tool/pubspec.yaml

@@ -0,0 +1,15 @@
+name: sync_relay_tool
+description: Spikes and harnesses.
+publish_to: none
+environment:
+  sdk: ^3.0.0
+dependencies:
+  sync_relay_core:
+    path: ../packages/core
+  sync_relay_server:
+    path: ../packages/server
+  relic: ^1.2.0
+  args: ^2.4.0
+  web_socket_channel: ^3.0.0
+dev_dependencies:
+  lints: ^5.0.0