新增 FlowScope Git 包雏形

Packages/com.flowscope.gamecore/README.md

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+# FlowScope Game Core
+
+FlowScope Game Core is a lightweight Unity runtime foundation for feature flow, dependency registration, resources, config, save, audio, and UGUI panel management.
+
+This package is currently a P2 preview package. Runtime, Addressables, and Editor sources are mirrored from the project-internal `Assets/FlowScope` implementation so a consuming Unity project can validate Git-based package installation.
+
+## Install From Git
+
+Add the package to the consuming project's `Packages/manifest.json`:
+
+```json
+{
+  "dependencies": {
+    "com.cysharp.r3": "https://github.com/Cysharp/R3.git?path=src/R3.Unity/Assets/R3.Unity#1.3.0",
+    "com.flowscope.gamecore": "ssh://git@192.168.9.108:2222/Developer/BombGameFramework.git?path=/Packages/com.flowscope.gamecore#codex/pre-p2-architecture-fixes"
+  }
+}
+```
+
+`com.cysharp.r3` must be declared by the consuming project because Unity Package Manager does not support Git dependencies inside a package's `package.json`.
+
+## Assembly Boundaries
+
+- `FlowScope.Runtime` references `R3.Unity`.
+- `FlowScope.Addressables` references `FlowScope.Runtime`, `Unity.Addressables`, and `Unity.ResourceManager`.
+- `FlowScope.Editor` is Editor-only and only provides read-only diagnostics.
+
+Runtime must not depend on Addressables, Editor, Samples, or Tests.
+