feat: release 2.2.0 with PC-only tests and execution reliability fixes

Unify task scheduling and queue state, fix Android input and observation recovery, preserve screenshot paths, and match final review criteria accurately. Add collapsible copyable results and publish the complete 2.1.0 upgrade notes. Validation: 3189 backend tests, 326 frontend tests, 24 client tests, production build and quality gates.

packages/artemis-client/README.md

@@ -7,6 +7,9 @@ ADB, device-driver, agent, LLM, or image-processing code.
 Runtime dependencies: **zero**. HTTP, JSON, and asynchronous adapters use only
 the Python standard library.
 
+Artemis 2.2.0 queues computer and Android tasks for serial execution. Legacy
+concurrency options cannot enable parallel execution on that server version.
+
 ## Installation
 
 Install from a local checkout:
@@ -44,6 +47,26 @@ and bearer-token authentication and exposes only task-related APIs.
 
 ## Usage
 
+PC-only tasks do not need Android or an emulator online. Enable and authorize a
+computer observation plugin on the host first, then use the same target as the
+web launcher's “仅 PC” checkbox:
+
+```python
+handle = await client.submit(
+    "Open the desktop browser and inspect the requested page",
+    profile="flash",  # "pro" is also supported
+    execution_target="computer",
+)
+```
+
+`run()` accepts the same argument. For task-like objects, use
+`Task(goal="Check desktop", execution_target="computer")` from the full runtime
+and pass it to `client.run_task()`. A saved Android device on the client is ignored
+for PC-only tasks. Per-task `options` are sent as the server's `runtime_overrides`,
+for example `options={"execution_target":"computer","plugins":[{"id":"cua-driver","profile":"default"}]}`.
+Plugin IDs must exist on the host; omitting `plugins` selects enabled authorized
+defaults for the target. Mixed tasks still require Android.
+
 For interactive case design, use `client.exploration` with the same actions as the
 web workspace and `mobile_exploration`. Use a stable request ID when retrying a write: