feat(daemon): per-surface status (set_state/state), idle-on-spawn, SPACESH_SOCK override

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

crates/spaceshd/src/lifecycle.rs

@@ -10,6 +10,11 @@ pub fn spacesh_dir() -> Result<PathBuf> {
 }
 
 pub fn socket_path() -> Result<PathBuf> {
+    if let Ok(p) = std::env::var("SPACESH_SOCK") {
+        if !p.is_empty() {
+            return Ok(PathBuf::from(p));
+        }
+    }
     Ok(spacesh_dir()?.join("sock"))
 }
 
@@ -67,4 +72,14 @@ mod tests {
         assert!(second.is_none(), "second acquire should be blocked");
         drop(first);
     }
+
+    #[test]
+    fn socket_path_honors_env_override() {
+        // Note: set/remove around the assertion; tests in this module run serially enough,
+        // but guard by restoring afterwards.
+        std::env::set_var("SPACESH_SOCK", "/tmp/spacesh-test-override.sock");
+        let p = socket_path().unwrap();
+        std::env::remove_var("SPACESH_SOCK");
+        assert_eq!(p, std::path::PathBuf::from("/tmp/spacesh-test-override.sock"));
+    }
 }