refactor: encapsulate internal context keys and add Get (by AI)

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog: @go/jsmod
+
+## v1.5.1 (2026-06-08)
+- **重构**: 完全隐藏内部 Context 键值（采用 `__GoJSContext__`），并废弃暴露的 `SafeModeKey`。
+- **新增**: 新增 `Get(ctx, key)` 辅助方法，统一承接来自 `go/js` 注入的 `map[string]any` 运行时配置。
+
+## [1.5.0] - 2026-05-10
+- 初始化模块。

jsmod.go

@@ -7,12 +7,22 @@ import (
 
 type contextKey string
 
-const SafeModeKey contextKey = "SafeMode"
+const internalContextKey contextKey = "__GoJSContext__"
+
+// Get retrieves an injected value from the context using the unified context map.
+func Get(ctx context.Context, key string) any {
+	if ctx == nil {
+		return nil
+	}
+	if m, ok := ctx.Value(internalContextKey).(map[string]any); ok {
+		return m[key]
+	}
+	return nil
+}
 
 // IsSafeMode checks if the provided context indicates that the execution is in safe mode.
 func IsSafeMode(ctx context.Context) bool {
-	v := ctx.Value(SafeModeKey)
-	if sm, ok := v.(bool); ok {
+	if sm, ok := Get(ctx, "SafeMode").(bool); ok {
 		return sm
 	}
 	return false // Default to false if not specified (internal trusted caller)