feat: add sdk/exec package to expose internal executor functionality

Add AntigravityExecutor and CodexExecutor wrappers that expose internal
executor implementations for external use by maxx.

- NewAntigravityExecutor() - creates Antigravity executor instance
- NewCodexExecutor() - creates Codex executor instance
- ValidateAntigravityToken() - validates refresh token and returns user info
- ValidateCodexToken() - validates Codex refresh token

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

sdk/exec/antigravity.go

@@ -0,0 +1,19 @@
+// Package exec provides SDK wrappers for CLIProxyAPI executor functionality.
+// This package exposes internal executor implementations for external use.
+package exec
+
+import (
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	internal "github.com/router-for-me/CLIProxyAPI/v6/internal/runtime/executor"
+
+	// Import builtin to register translators (claude -> antigravity, etc.)
+	_ "github.com/router-for-me/CLIProxyAPI/v6/sdk/translator/builtin"
+)
+
+// AntigravityExecutor is a type alias for the internal AntigravityExecutor.
+type AntigravityExecutor = internal.AntigravityExecutor
+
+// NewAntigravityExecutor creates a new AntigravityExecutor instance.
+func NewAntigravityExecutor() *AntigravityExecutor {
+	return internal.NewAntigravityExecutor(&config.Config{})
+}

sdk/exec/codex.go

@@ -0,0 +1,18 @@
+// Package exec provides SDK wrappers for CLIProxyAPI executor functionality.
+// This file exposes the internal CodexExecutor for external use.
+// Token management (access_token refresh) is the caller's responsibility;
+// the caller should set auth.Metadata["access_token"] before calling Execute/ExecuteStream.
+package exec
+
+import (
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	internal "github.com/router-for-me/CLIProxyAPI/v6/internal/runtime/executor"
+)
+
+// CodexExecutor is a type alias for the internal CodexExecutor.
+type CodexExecutor = internal.CodexExecutor
+
+// NewCodexExecutor creates a new CodexExecutor instance.
+func NewCodexExecutor() *CodexExecutor {
+	return internal.NewCodexExecutor(&config.Config{})
+}