feat: test runner and ScriptableObject commands (v2.2.0)

[niqibiao]

Adds two capability groups to the command surface and bumps the package to 2.2.0.

Test runner — editor/test.run, editor/test.status

Drives the Unity Test Framework through TestRunnerApi. test.run starts an
EditMode or PlayMode run with optional testNames/groupNames filters and
returns a run id; test.status reports the phase and the structured result
(counts, duration, and up to 25 failures with truncated messages).

Two details worth review attention:

• The commands stay registered when com.unity.test-framework is absent.
  The CLI's overlay validation requires strict overlay↔registry equality, so
  conditional registration would break discovery in projects without the
  framework. Instead an asmdef versionDefines entry gates the
  implementation, and the absent case returns an explanatory validation error.
• The run record lives in Library/CSharpConsole/test_run_state.json. The
  editor recreates Temp/ on every start, so a record kept there could never
  survive to report an interrupted run as aborted. A SessionState sentinel
  distinguishes "still running in this session" from "the editor restarted
  mid-run", and [InitializeOnLoadMethod] re-registers the callbacks after
  each domain reload.

ScriptableObject authoring — scriptableobject/create|get|modify

Creates SO assets by type name and reads/writes their serialized fields via
SerializedObject, following the existing material command idiom. Save paths
must sit under Assets/ and end in .asset; the type must be a concrete
ScriptableObject.

Also

• READMEs state the trusted-LAN service model explicitly: the service binds all
  interfaces without authentication by design and must not be exposed to
  untrusted networks.
• Command tables and counts updated; the previously documented 57 was wrong —
  the registry holds 56 (51 authoring + 5 control), now 61 with these five.

Validation

Live-tested on two projects, including one using HybridCLR/IL2CPP: editor
compile, full EditMode suite, PlayMode run, and a Windows IL2CPP development
build. The build confirms the new asmdef TestRunner references do not reach
the player (ScriptingAssemblies.json carries no TestRunner/NUnit), the
runtime service starts and answers commands, and the editor-only commands are
correctly absent in the player.

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