fix: update doctests for mergegate_core rename

crates/mergegate-core/src/agent/approval.rs

@@ -39,7 +39,7 @@ pub struct ApprovalRequest {
 /// # Example
 ///
 /// ```rust
-/// use miyabi_core::agent::{ApprovalCallback, ApprovalRequest, ApprovalDecision};
+/// use mergegate_core::agent::{ApprovalCallback, ApprovalRequest, ApprovalDecision};
 /// use async_trait::async_trait;
 ///
 /// struct AutoApprover;
@@ -49,7 +49,7 @@ pub struct ApprovalRequest {
 ///     async fn request_approval(&self, request: &ApprovalRequest) -> ApprovalDecision {
 ///         // Auto-approve low risk tools
 ///         match request.risk_level {
-///             miyabi_core::agent::RiskLevel::Low => ApprovalDecision::Approved,
+///             mergegate_core::agent::RiskLevel::Low => ApprovalDecision::Approved,
 ///             _ => ApprovalDecision::Rejected(Some("Manual approval required".to_string())),
 ///         }
 ///     }

crates/mergegate-core/src/feature_flags.rs

@@ -5,7 +5,7 @@
 //! # Examples
 //!
 //! ```rust
-//! use miyabi_core::feature_flags::FeatureFlagManager;
+//! use mergegate_core::feature_flags::FeatureFlagManager;
 //!
 //! let manager = FeatureFlagManager::new();
 //! manager.set_flag("new_architecture", true);

crates/mergegate-core/src/git.rs

@@ -16,11 +16,11 @@ use std::path::{Path, PathBuf};
 /// # Examples
 ///
 /// ```no_run
-/// use miyabi_core::git::find_git_root;
+/// use mergegate_core::git::find_git_root;
 ///
 /// let root = find_git_root(None)?;
 /// println!("Git root: {:?}", root);
-/// # Ok::<(), miyabi_core::error::Error>(())
+/// # Ok::<(), mergegate_core::error::Error>(())
 /// ```
 pub fn find_git_root(start_path: Option<&Path>) -> Result<PathBuf> {
     let search_path = match start_path {

crates/mergegate-core/src/plugin.rs

@@ -5,7 +5,7 @@
 //! # Example
 //!
 //! ```rust
-//! use miyabi_core::plugin::{Plugin, PluginManager, PluginMetadata, PluginContext, PluginResult};
+//! use mergegate_core::plugin::{Plugin, PluginManager, PluginMetadata, PluginContext, PluginResult};
 //! use anyhow::Result;
 //!
 //! struct MyPlugin;