补齐 package Tests 第一刀

Packages/com.flowscope.gamecore/Tests~/README.md

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+# FlowScope Package Tests
+
+This directory contains the first package-level test slice for FlowScope Game Core.
+
+The current tests are intentionally small. They prove that a package test assembly can reference:
+
+- `FlowScope.Runtime`
+- `FlowScope.Addressables`
+- Unity Test Framework / NUnit
+
+The full development test suite still lives under `My project/Assets/FlowScope/Tests` during P2 migration. Real Addressables fixture validation also remains in the development project because Addressables settings are project-level assets.
+
+## Current Scope
+
+- `EditMode/PackageSmokeTests.cs`
+
+## Not Migrated Yet
+
+- Full Runtime EditMode tests.
+- Full PlayMode tests.
+- MainMenuP0 sample tests.
+- Real Addressables fixture tests.