feat(daemon): RestartSurface honors resume — swap to resume_args when mapped

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/spaceshd/src/server.rs

@@ -291,6 +291,23 @@ fn spawn_env(sid: &SurfaceId, spec: &spacesh_proto::workspace::SurfaceSpec) -> (
     (env, active)
 }
 
+/// Build the spawn spec for a (re)start. When `resume` and the command has a
+/// resume mapping, its args are replaced with the resume args; otherwise the
+/// original spec args are kept.
+fn resume_spec(
+    spec: &spacesh_proto::workspace::SurfaceSpec,
+    resume: bool,
+    cfg: &crate::config::Config,
+) -> spacesh_proto::workspace::SurfaceSpec {
+    let mut out = spec.clone();
+    if resume {
+        if let Some(args) = cfg.resume_args(&spec.command) {
+            out.args = args;
+        }
+    }
+    out
+}
+
 /// Emit a `layout_changed` event for a workspace's current tree.
 fn emit_layout(reg: &Registry, ws_id: &WorkspaceId, clients: &HashMap<ClientId, ClientTx>) {
     if let Some(w) = reg.workspace(ws_id) {
@@ -475,13 +492,14 @@ async fn handle_request(
             let _ = out.send(ok(id, serde_json::json!({ "surface_ids": new_ids.iter().map(|s| s.0.clone()).collect::<Vec<_>>() }))).await;
         }
 
-        Cmd::RestartSurface { surface_id } => {
+        Cmd::RestartSurface { surface_id, resume } => {
             if reg.is_running(&surface_id) {
                 let _ = out.send(ok(id, serde_json::Value::Null)).await; return; // already running
             }
             let Some(spec) = reg.surface_spec(&surface_id) else {
                 let _ = out.send(err(id, "NOT_FOUND", "surface")).await; return;
             };
+            let spec = resume_spec(&spec, resume, config);
             let ws_id = reg.workspace_of(&surface_id).unwrap();
             let (env, hooks_active) = spawn_env(&surface_id, &spec);
             match crate::surface::spawn_from_spec(surface_id.clone(), ws_id.clone(), &spec, env, hooks_active, state_tx.clone(), exit_tx.clone(), snapshot_tx.clone()) {
@@ -1607,4 +1625,25 @@ mod tests {
         let snap = data["snapshot"].as_str().unwrap_or("");
         assert!(snap.contains("SNAPDISK"), "on-disk snapshot should contain SNAPDISK, got: {snap:?}");
     }
+
+    #[test]
+    fn resume_spec_swaps_args_when_mapped() {
+        use spacesh_proto::workspace::SurfaceSpec;
+        let spec = SurfaceSpec {
+            command: "claude".into(), args: vec!["--foo".into()], cwd: "/tmp".into(),
+            agent_label: Some("claude".into()), cols: 80, rows: 24, autostart: false,
+        };
+        let cfg = crate::config::Config::default();
+        // resume=false → original args
+        let plain = resume_spec(&spec, false, &cfg);
+        assert_eq!(plain.args, vec!["--foo".to_string()]);
+        // resume=true with a default mapping → resume args
+        let resumed = resume_spec(&spec, true, &cfg);
+        assert_eq!(resumed.args, vec!["--continue".to_string()]);
+        // resume=true for an unmapped command → original args (graceful fallback)
+        let mut shell = spec.clone();
+        shell.command = "bash".into();
+        let resumed_shell = resume_spec(&shell, true, &cfg);
+        assert_eq!(resumed_shell.args, shell.args);
+    }
 }