feat: centralize config paths and expose in snapshot

apps/macos/Sources/Clawdis/ClawdisPaths.swift

@@ -0,0 +1,37 @@
+import Foundation
+
+enum ClawdisEnv {
+    static func path(_ key: String) -> String? {
+        guard let value = ProcessInfo.processInfo.environment[key]?
+            .trimmingCharacters(in: .whitespacesAndNewlines),
+            !value.isEmpty
+        else {
+            return nil
+        }
+        return value
+    }
+}
+
+enum ClawdisPaths {
+    private static let configPathEnv = "CLAWDIS_CONFIG_PATH"
+    private static let stateDirEnv = "CLAWDIS_STATE_DIR"
+
+    static var stateDirURL: URL {
+        if let override = ClawdisEnv.path(self.stateDirEnv) {
+            return URL(fileURLWithPath: override, isDirectory: true)
+        }
+        return FileManager.default.homeDirectoryForCurrentUser
+            .appendingPathComponent(".clawdis", isDirectory: true)
+    }
+
+    static var configURL: URL {
+        if let override = ClawdisEnv.path(self.configPathEnv) {
+            return URL(fileURLWithPath: override)
+        }
+        return self.stateDirURL.appendingPathComponent("clawdis.json")
+    }
+
+    static var workspaceURL: URL {
+        self.stateDirURL.appendingPathComponent("workspace", isDirectory: true)
+    }
+}