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/deterministic-tests/tsconfig.json

@@ -0,0 +1,12 @@
+{
+    "compilerOptions": {
+        "baseUrl": ".",
+        "strict": true,
+        "target": "ES2022",
+        "module": "CommonJS",
+        "esModuleInterop": true,
+        "lib": ["DOM", "ES2024"],
+        "moduleResolution": "node"
+    },
+    "exclude": ["./dist"]
+}