refactor: remove sandbox system and simplify agent architecture

Remove the entire sandbox security system including:
- All sandbox-related Rust code and dependencies (gaol crate)
- Sandbox command handlers and platform-specific implementations
- Comprehensive test suite for sandbox functionality
- Agent sandbox settings UI components

Simplify agent configuration by removing sandbox and permission fields:
- Remove sandbox_enabled, enable_file_read, enable_file_write, enable_network from agent configs
- Update all CC agents to use simplified configuration format
- Remove sandbox references from documentation and UI

src-tauri/src/main.rs

@@ -5,7 +5,6 @@ mod checkpoint;
 mod claude_binary;
 mod commands;
 mod process;
-mod sandbox;
 
 use checkpoint::state::CheckpointState;
 use commands::agents::{
@@ -34,13 +33,6 @@ use commands::mcp::{
     mcp_read_project_config, mcp_remove, mcp_reset_project_choices, mcp_save_project_config,
     mcp_serve, mcp_test_connection,
 };
-use commands::sandbox::{
-    clear_sandbox_violations, create_sandbox_profile, create_sandbox_rule, delete_sandbox_profile,
-    delete_sandbox_rule, export_all_sandbox_profiles, export_sandbox_profile,
-    get_platform_capabilities, get_sandbox_profile, get_sandbox_violation_stats,
-    import_sandbox_profiles, list_sandbox_profiles, list_sandbox_rules, list_sandbox_violations,
-    log_sandbox_violation, test_sandbox_profile, update_sandbox_profile, update_sandbox_rule,
-};
 use commands::screenshot::{capture_url_screenshot, cleanup_screenshot_temp_files};
 use commands::usage::{
     get_session_stats, get_usage_by_date_range, get_usage_details, get_usage_stats,
@@ -53,14 +45,6 @@ fn main() {
     // Initialize logger
     env_logger::init();
 
-    // Check if we need to activate sandbox in this process
-    if sandbox::executor::should_activate_sandbox() {
-        // This is a child process that needs sandbox activation
-        if let Err(e) = sandbox::executor::SandboxExecutor::activate_sandbox_in_child() {
-            log::error!("Failed to activate sandbox: {}", e);
-            // Continue without sandbox rather than crashing
-        }
-    }
 
     tauri::Builder::default()
         .plugin(tauri_plugin_dialog::init())
@@ -161,24 +145,6 @@ fn main() {
             fetch_github_agents,
             fetch_github_agent_content,
             import_agent_from_github,
-            list_sandbox_profiles,
-            get_sandbox_profile,
-            create_sandbox_profile,
-            update_sandbox_profile,
-            delete_sandbox_profile,
-            list_sandbox_rules,
-            create_sandbox_rule,
-            update_sandbox_rule,
-            delete_sandbox_rule,
-            test_sandbox_profile,
-            get_platform_capabilities,
-            list_sandbox_violations,
-            log_sandbox_violation,
-            clear_sandbox_violations,
-            get_sandbox_violation_stats,
-            export_sandbox_profile,
-            export_all_sandbox_profiles,
-            import_sandbox_profiles,
             get_usage_stats,
             get_usage_by_date_range,
             get_usage_details,