split: deterministic-tests, obsidian-plugin, local-cli, test-client, frontend root

New deterministic-tests workspace: scripted multi-client harness against
a real server (~110 scenario tests, server-control, managed-websocket,
test-runner). Updates to existing workspaces: obsidian-plugin (settings,
cursors, plugin entrypoint), local-client-cli (args, cli, file-watcher,
node-filesystem, path-utils + tests), test-client (mock-agent/client,
cli, error tracker). Bumps frontend root package.json/lock and adds
eslint config tweaks.

frontend/test-client/tsconfig.json

@@ -5,13 +5,8 @@
         "target": "ES2022",
         "module": "CommonJS",
         "esModuleInterop": true,
-        "lib": [
-            "DOM",
-            "ES2024",
-        ],
+        "lib": ["DOM", "ES2024"],
         "moduleResolution": "node"
     },
-    "exclude": [
-        "./dist"
-    ]
+    "exclude": ["./dist"]
 }