docs: annotate nix path resolution

apps/macos/Sources/Clawdis/ClawdisPaths.swift

@@ -2,6 +2,7 @@ import Foundation
 
 enum ClawdisEnv {
     static func path(_ key: String) -> String? {
+        // Normalize env overrides once so UI + file IO stay consistent.
         guard let value = ProcessInfo.processInfo.environment[key]?
             .trimmingCharacters(in: .whitespacesAndNewlines),
             !value.isEmpty

apps/macos/Sources/Clawdis/DeviceModelCatalog.swift

@@ -122,6 +122,7 @@ enum DeviceModelCatalog {
     }
 
     private static func locateResourceBundle() -> Bundle? {
+        // Prefer module bundle (SwiftPM/tests), then main app bundle (packaged app).
         if let bundle = self.bundleIfContainsDeviceModels(Bundle.module) {
             return bundle
         }

apps/macos/Sources/Clawdis/SettingsRootView.swift

@@ -105,6 +105,7 @@ struct SettingsRootView: View {
     }
 
     private var nixManagedBanner: some View {
+        // Prefer gateway-resolved paths; fall back to local env defaults if disconnected.
         let snapshotPaths = GatewayConnection.shared.snapshotPaths()
         let configPath = snapshotPaths.configPath ?? ClawdisPaths.configURL.path
         let stateDir = snapshotPaths.stateDir ?? ClawdisPaths.stateDirURL.path