[goose2] MCP Apps: translate ACP host capabilities into MCP initialization (#8623)

Signed-off-by: Andrew Harvard <aharvard@squareup.com>

crates/goose/tests/acp_fixtures/mod.rs

@@ -5,6 +5,7 @@ use async_trait::async_trait;
 use fs_err as fs;
 use goose::acp::server::{serve, AcpProviderFactory, GooseAcpAgent};
 pub use goose::acp::{map_permission_response, PermissionDecision};
+use goose::agents::GoosePlatform;
 use goose::builtin_extension::register_builtin_extensions;
 use goose::config::paths::Paths;
 use goose::config::{GooseMode, PermissionManager};
@@ -190,6 +191,7 @@ pub async fn spawn_acp_server_in_process(
         data_root.to_path_buf(),
         goose_mode,
         true,
+        GoosePlatform::GooseCli,
     )
     .await
     .unwrap();

crates/goose/tests/mcp_integration_test.rs

@@ -261,7 +261,10 @@ async fn test_replayed_session(
         provider,
         session_manager,
         GoosePlatform::GooseDesktop.to_string(),
-        ExtensionManagerCapabilities { mcpui: true },
+        ExtensionManagerCapabilities {
+            mcpui: true,
+            host_info: None,
+        },
     ));
 
     #[allow(clippy::redundant_closure_call)]