Sync the self-hosting stack

CHANGELOG.md

@@ -9,6 +9,26 @@ one of them changed. An entry says which artefact and which version, so `web 0.1
 Every version published to a channel appears here. Nothing is written from memory afterwards: a build
 cannot be published without its entry.
 
+## 2026-10-08 — H.265 video for very large screens in the remote-desktop viewer `agent 0.46.0` `api 0.128.0` `web 0.156.0`
+
+The "Picture mode" menu of the remote-desktop viewer has a third mode, H.265 video. H.264 carries a
+screen up to about 4096 × 2304; H.265 goes up to 8192 × 4320, so a very large or very wide screen
+(two 4K monitors side by side, for example) can now be watched as smooth video instead of JPEG
+images.
+
+You do not have to choose it: when nobody has chosen a mode, a screen that fits H.264 stays on
+H.264 and a larger one goes to H.265 by itself, and the menu shows the mode that is actually
+arriving. Choosing H.265 on a smaller screen works too.
+
+H.265 is encoded by the remote machine's graphics card. A machine without a hardware HEVC encoder,
+such as a virtual machine without a GPU or most servers, falls back to H.264 when the screen fits it
+and to JPEG images otherwise, and its agent log says why. Your browser must also be able to decode
+H.265, which Chrome and Edge do on a computer with a recent graphics card; without that, the menu
+does not offer H.265.
+
+Update the API, the web image and the agent release image. No database update is required. With an
+older agent or an older API, the menu offers JPEG and H.264 as before.
+
 ## 2026-10-08 — Show or hide the remote cursor from the remote-desktop viewer `web 0.155.0`
 
 The remote-desktop toolbar has a new cursor button, next to the size button. It hides the remote