fix: honor nix config overrides in mac app

apps/macos/Sources/Clawdis/ClawdisConfigFile.swift

@@ -2,16 +2,27 @@ import Foundation
 
 enum ClawdisConfigFile {
     private static let logger = Logger(subsystem: "com.steipete.clawdis", category: "config")
+    private static let configPathEnv = "CLAWDIS_CONFIG_PATH"
+    private static let stateDirEnv = "CLAWDIS_STATE_DIR"
 
     static func url() -> URL {
-        FileManager.default.homeDirectoryForCurrentUser
-            .appendingPathComponent(".clawdis")
+        if let override = self.envPath(self.configPathEnv) {
+            return URL(fileURLWithPath: override)
+        }
+        return self.stateDirURL()
             .appendingPathComponent("clawdis.json")
     }
 
+    static func stateDirURL() -> URL {
+        if let override = self.envPath(self.stateDirEnv) {
+            return URL(fileURLWithPath: override, isDirectory: true)
+        }
+        return FileManager.default.homeDirectoryForCurrentUser
+            .appendingPathComponent(".clawdis", isDirectory: true)
+    }
+
     static func defaultWorkspaceURL() -> URL {
-        FileManager.default.homeDirectoryForCurrentUser
-            .appendingPathComponent(".clawdis")
+        self.stateDirURL()
             .appendingPathComponent("workspace", isDirectory: true)
     }
 
@@ -96,4 +107,12 @@ enum ClawdisConfigFile {
         self.saveDict(root)
         self.logger.debug("agent workspace updated set=\(!trimmed.isEmpty)")
     }
+
+    private static func envPath(_ key: String) -> String? {
+        guard let value = ProcessInfo.processInfo.environment[key]?.trimmingCharacters(in: .whitespacesAndNewlines),
+              !value.isEmpty else {
+            return nil
+        }
+        return value
+    }
 }