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/src/tests/8-concurrent-rename-and-create-at-target.test.ts

@@ -0,0 +1,49 @@
+import type { AssertableState } from "../utils/assertable-state";
+import type { TestDefinition } from "../test-definition";
+
+export const concurrentRenameAndCreateAtTargetTest: TestDefinition = {
+    description:
+        "One client renames X to Y while another creates a new file at Y, " +
+        "both offline. After syncing, Y should contain merged content from " +
+        "both the renamed file and the newly created file.",
+    clients: 2,
+    steps: [
+        {
+            type: "create",
+            client: 0,
+            path: "X.md",
+            content: "original file X"
+        },
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "barrier" },
+
+        { type: "disable-sync", client: 0 },
+        { type: "disable-sync", client: 1 },
+
+        { type: "rename", client: 0, oldPath: "X.md", newPath: "Y.md" },
+
+        {
+            type: "create",
+            client: 1,
+            path: "Y.md",
+            content: "brand new Y content"
+        },
+
+        { type: "enable-sync", client: 1 },
+        { type: "sync", client: 1 },
+
+        { type: "enable-sync", client: 0 },
+        { type: "barrier" },
+
+        {
+            type: "assert-consistent",
+            verify: (state: AssertableState): void => {
+                state
+                    .assertFileCount(2)
+                    .assertContains("Y (1).md", "original file X")
+                    .assertContains("Y.md", "brand new Y content");
+            }
+        }
+    ]
+};