revert(mibook): remove boot-time terminal/desktop choice feature

Back out the entire "choose terminal-only vs KDE at boot" work. The first
attempt (default multi-user.target + on-demand desktop) locked mibook out —
it is WiFi-only with credentials in KWallet, so a headless boot has no
network and no SSH. The follow-up specialisation redesign is no longer
wanted either.

mibook returns to plain always-KDE boot (the pre-feature baseline):
- machines/mibook/configuration.nix: drop specialisation.terminal and the
  NetworkManager-wait-online override.
- machines/mibook/environments.nix: drop kde-desktop.startOnBoot.
- modules/environments/kde-desktop/default.nix: drop the startOnBoot option.
- remove the boot-desktop-choice design spec.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1wvPy5kbGp8pUQX61WBCY

docs/superpowers/specs/2026-07-26-jellyfin-hw-transcoding.md

@@ -106,3 +106,40 @@ show up as low CPU, some GPU (`intel_gpu_top`) activity instead.
 - Exact supported codec list depends on the iGPU generation (device ID
   `9a49`) — confirm via `vainfo` output once run, and enable only the
   hardware decode paths it actually reports.
+
+## Post-deploy fix: two additional runtime packages required
+
+After the initial deploy (Task 1's `SupplementaryGroups` grant) and
+enabling QSV in the dashboard, HEVC HDR playback hung indefinitely
+(Direct Play worked for some titles; titles that needed a real
+transcode+tonemap never produced output). Root-caused via
+`journalctl -u jellyfin` and the per-session ffmpeg transcode log
+(`find / -xdev -iname '*ffmpeg-transcode*'`) — two separate runtimes
+were missing beyond `intel-media-driver` (which only provides VAAPI):
+
+1. **QSV session creation failed:** `Error creating a MFX session: -9`
+   / `Error initializing an MFX session: -3` on
+   `-init_hw_device qsv=qs@va`. VAAPI and QSV are separate runtimes on
+   Linux — QSV needs the oneVPL/MFX GPU implementation. Fix: added
+   `pkgs.vpl-gpu-rt` ("oneAPI Video Processing Library Intel GPU
+   implementation"; note `onevpl-intel-gpu` is the old, renamed
+   attribute) to `hardware.graphics.extraPackages` in
+   `machines/jupiter/hardware-configuration.nix`.
+
+2. **OpenCL device creation failed:** `Failed to get number of OpenCL
+   platforms: -1001` (`CL_PLATFORM_NOT_FOUND_KHR`) on
+   `-init_hw_device opencl=ocl@va`. The `tonemap_opencl` filter jellyfin
+   uses for HDR→SDR tone-mapping needs a working OpenCL ICD, which
+   nothing installed so far provides. Fix: added
+   `pkgs.intel-compute-runtime` ("Intel Graphics Compute Runtime oneAPI
+   Level Zero and OpenCL, supporting 12th Gen and newer" — matches
+   jupiter's Tiger Lake/Xe iGPU) to the same `extraPackages` list.
+
+Confirmed working end-to-end: HEVC HDR transcode with QSV encode +
+OpenCL tone-map runs at `speed=2.68x` realtime on jupiter's iGPU, and
+plays smoothly on Apple TV (JellyTV app).
+
+Both packages live in `machines/jupiter/hardware-configuration.nix`
+(`hardware.graphics.extraPackages`), alongside `intel-media-driver`,
+rather than in the jellyfin module itself — they're iGPU runtime
+capabilities, not something specific to the jellyfin service.

flake.lock

@@ -89,11 +89,11 @@
         "nixpkgs-regression": "nixpkgs-regression"
       },
       "locked": {
-        "lastModified": 1784375420,
+        "lastModified": 1784762557,
-        "narHash": "sha256-dt1zVj4MRpmffhsgQk+3tx1m/pFTXbtVWrn5KZ1y+8Q=",
+        "narHash": "sha256-R/r6jRnANV50c8F5Fz5+1Q1moab0IGWRk+cg5ME2nMY=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "bebd2f851a304e9fb2e143ce0cbeff577c6a37ac",
+        "rev": "d10c84cd0cc0efdcb29cf2611caf5fbcd10fa071",
         "type": "github"
       },
       "original": {
@@ -143,11 +143,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1784310968,
+        "lastModified": 1784723954,
-        "narHash": "sha256-rkSPTePrKqs4dg+i7ZFCq93+HrClac6oSwXX927SVjA=",
+        "narHash": "sha256-1CfD8ZUjCkTgjsneLZ/lxCHhgDfqxxE7/GX0MmsgiqA=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "779c32a00155994c86cde8213a8dd4df139d4355",
+        "rev": "a017f5b72210026af5b3ac5949f08d94380a6fbd",
         "type": "github"
       },
       "original": {
@@ -218,11 +218,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1784497964,
+        "lastModified": 1784796856,
-        "narHash": "sha256-WhdsTtaih3DgTPP/PX023b36UNQyMzEoi6GkPyGx0y4=",
+        "narHash": "sha256-vwxWgF+Gj276WznzGb1LxGsK/39HaQwgQXiU3EkC844=",
-        "rev": "241313f4e8e508cb9b13278c2b0fa25b9ca27163",
+        "rev": "e2587caef70cea85dd97d7daab492899902dbf5d",
         "type": "tarball",
-        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1037713.241313f4e8e5/nixexprs.tar.xz"
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1040357.e2587caef70c/nixexprs.tar.xz"
       },
       "original": {
         "id": "nixpkgs",
@@ -245,11 +245,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1784432872,
+        "lastModified": 1784707089,
-        "narHash": "sha256-IX7j5TvSD7hYC9NZ8mgmq7pZ97mYyl24Qs4Tz4uyvO4=",
+        "narHash": "sha256-DUedXhD2Rg8q4Xyd07Sb90eZGy4gg6W+Vl/WbLNwAZo=",
-        "rev": "fd1462031fdee08f65fd0b4c6b64e22239a77870",
+        "rev": "b3fe9581c9061c749abef42b6d4ee7b7c05c33fa",
         "type": "tarball",
-        "url": "https://releases.nixos.org/nixos/26.05/nixos-26.05.5591.fd1462031fde/nixexprs.tar.xz"
+        "url": "https://releases.nixos.org/nixos/26.05/nixos-26.05.5845.b3fe9581c906/nixexprs.tar.xz"
       },
       "original": {
         "id": "nixpkgs",

machines/mibook/configuration.nix

@@ -44,6 +44,14 @@
 
   services.openssh.enable = true;
 
+  # KDE (PowerDevil) power settings: do nothing on lid close while on AC power.
+  # Shipped as a system-wide default; KConfig cascades so a user's own
+  # ~/.config/powerdevilrc will override this if present.
+  environment.etc."xdg/powerdevilrc".text = ''
+    [AC][SuspendAndShutdown]
+    LidAction=0
+  '';
+
   system = {
     stateVersion = "23.05";
     autoUpgrade.enable = true;