Add ACP agent backend and terminal controls

crates/acp/src/lib.rs

@@ -0,0 +1,26 @@
+//! Runtime support for driving ACP agents from Galaxy.
+//!
+//! This crate deliberately contains no Galaxy UI or application-model code. It
+//! owns the ACP subprocess and translates the stable ACP v1 stream into a small
+//! event surface that the app can consume.
+
+mod config;
+mod events;
+mod permissions;
+mod runtime;
+
+pub use agent_client_protocol::schema::v1::{
+    ContentBlock, Cost, ImageContent, McpServer, McpServerHttp, McpServerStdio, PermissionOptionId,
+    SessionId, StopReason, TextContent, ToolCallId, ToolCallStatus,
+};
+pub use config::{
+    AcpAgentPreset, AcpLaunchConfig, AcpManagerConfig, CODEX_ACP_NPM_VERSION, OPENCODE_NPM_VERSION,
+};
+pub use events::AcpEvent;
+pub use permissions::{
+    AcpPermissionPolicy, DenyByDefaultPermissionHandler, PermissionContext, PermissionDecision,
+    PermissionHandler,
+};
+pub use runtime::{
+    AcpRuntimeError, AcpSessionHandle, AcpSessionManager, AcpSteeringOutcome, AcpTurnRequest,
+};