refactor: make Orion sole transcription owner

modules/capabilities/transcription.nix

@@ -11,7 +11,6 @@ in
       ...
     }:
     let
-      isOrion = config.facts.machine.name == "orion";
       modelName = "large-v3-turbo-q5_0";
       modelHash = "sha256-OUIhcJzVrR9AxG5gMcphvOiJMebgiMGIKUxtWlX/p+I=";
       modelSha256 = builtins.convertHash {
@@ -38,8 +37,7 @@ in
           ${builtins.readFile ./_diarize-transcript.py}
         '';
       };
-      whisper = if isOrion then pkgs.whisper-cpp else pkgs.whisper-cpp-vulkan;
-      acceleration = if isOrion then "CPU" else "Vulkan";
+      whisper = pkgs.whisper-cpp;
       prepareDiarizationModel = pkgs.writeShellApplication {
         name = "prepare-transcription-diarization-model";
         runtimeInputs = with pkgs; [
@@ -104,7 +102,7 @@ in
           Type = "oneshot";
           ExecStart = lib.getExe transcribeRecordings;
           Environment = [
-            "TRANSCRIBE_ENGINE_ACCELERATION=${acceleration}"
+            "TRANSCRIBE_ENGINE_ACCELERATION=CPU"
             "TRANSCRIBE_ENGINE_VERSION=${whisper.version}"
             "TRANSCRIBE_MODEL=${model}"
             ''"TRANSCRIBE_MODEL_NAME=${modelName} multilingual"''
@@ -116,16 +114,14 @@ in
             "TRANSCRIBE_SETTLE_SECONDS=300"
             "TRANSCRIBE_SYNC_ROOT=${home}/sync"
           ];
-        }
-        // lib.optionalAttrs isOrion {
           Restart = "on-failure";
           RestartSec = 60;
         };
 
-        Install.WantedBy = lib.optionals isOrion [ "default.target" ];
+        Install.WantedBy = [ "default.target" ];
       };
 
-      systemd.user.paths.transcribe-recordings = lib.mkIf isOrion {
+      systemd.user.paths.transcribe-recordings = {
         Unit.Description = "Watch for synchronized recordings";
 
         Path = {
@@ -135,17 +131,6 @@ in
 
         Install.WantedBy = [ "paths.target" ];
       };
-
-      systemd.user.timers.transcribe-recordings = lib.mkIf (!isOrion) {
-        Unit.Description = "Transcribe new recordings every two minutes";
-
-        Timer = {
-          OnCalendar = "*:0/2";
-          Persistent = true;
-        };
-
-        Install.WantedBy = [ "timers.target" ];
-      };
     };
 
   flake.modules.nixos.transcription =