Merge main into experimental: get.sh --branch and the hand recorder page

PR #29 was squash-merged, so main and experimental last shared history at
1ebf369 and 11 files conflicted. Main's copy of each was the PR #29 head
(ec870d2), which experimental already has, so experimental's side is kept
for all of them. The result is experimental plus main's get.sh and
hand-recorder.md, and main can take experimental with a merge commit again.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

get.sh

@@ -9,6 +9,7 @@
 # Options (piped, they go after "bash -s --"):
 #   --stable        the main branch: tested releases (the default for a new install)
 #   --experimental  the experimental branch: the newest features, less tested
+#   --branch NAME   another branch, such as a fix to test before it's released
 #   --dir DIR       where the repo goes (default ~/frametop)
 #   --clone-only    get or update the repo, but don't run install.sh
 #   --yes, --no-bluetooth   passed to install.sh (--yes also answers this script's question:
@@ -17,7 +18,7 @@ set -euo pipefail
 
 usage() {
   cat <<'EOF'
-usage: get.sh [--stable | --experimental] [--dir DIR] [--clone-only] [--yes] [--no-bluetooth]
+usage: get.sh [--stable | --experimental | --branch NAME] [--dir DIR] [--clone-only] [--yes] [--no-bluetooth]
 piped: curl -fsSL https://deejanuz.github.io/frametop/get.sh | bash -s -- [options]
 EOF
 }
@@ -31,6 +32,7 @@ main() {
     case $1 in
       --stable) branch=main ;;
       --experimental) branch=experimental ;;
+      --branch) branch=${2:?--branch needs a branch name}; shift ;;
       --dir) dir=${2:?--dir needs a folder}; shift ;;
       --clone-only) clone_only=1 ;;
       --yes) yes=1; pass+=("$1") ;;
@@ -80,6 +82,11 @@ main() {
     fi
   fi
 
+  if ! git ls-remote --exit-code --heads "$repo" "$branch" >/dev/null; then
+    echo "Frametop has no branch called $branch (or GitHub can't be reached)." >&2
+    return 1
+  fi
+
   if [ ! -e "$dir" ]; then
     echo "Cloning Frametop ($branch) into $dir"
     git clone --branch "$branch" "$repo" "$dir"

hand-recorder.md

@@ -0,0 +1,68 @@
+---
+title: Install the Frametop Hand Recorder
+---
+
+# Install the Frametop Hand Recorder
+
+The Hand Recorder records your hands with the Steam Frame's tracking cameras for Frametop's open hand dataset ([DeeJanuz/frametop-hands](https://huggingface.co/datasets/DeeJanuz/frametop-hands) on Hugging Face). These are the Konsole commands to install it.
+
+> **Known issue (October 5, 2026):** the recorder currently works only on headsets with the Arcturus color passthrough module attached. Without the module, the camera check stops with "Not all of the headset's tracking cameras are running (ft-camd publishes only 2 of 4 mono cameras ...)", and restarting SteamVR or the headset doesn't help. A fix for headsets without the module will be published within 24 hours (by October 6). Once it's out, run the commands under [Update](#update).
+
+Join the [Frametop Discord](https://discord.gg/W3X9f7z3Bc) for questions and help with recording.
+
+For now the recorder runs inside Frametop's desktop, so these steps install Frametop first. A standalone recorder that runs from the SteamVR dashboard without Frametop is planned.
+
+## Before you start
+
+- You must be 18 or older, and for now you can't take part if you live in Illinois, Texas or Washington (USA). The [consent text](https://github.com/DeeJanuz/frametop/blob/main/hands/rec/CONSENT.md) explains what's recorded and what you agree to. The recorder shows it again before your first session.
+- You need a Steam Frame on the stable SteamOS release (not the beta), an internet connection, and a keyboard (Bluetooth, or the on-screen one).
+- You need a `sudo` password. If you've never set one, run `passwd` in Konsole first.
+- Recordings are several gigabytes per round, and uploading one needs about the same again free while it runs. `df -h ~` shows your free space.
+
+## Open Konsole
+
+1. In the launcher, choose Launch a program → Desktop.
+2. In the application menu, open System → Konsole.
+
+## 1. Install Frametop
+
+```
+curl -fsSL https://deejanuz.github.io/frametop/get.sh | bash -s -- --stable
+```
+
+This clones Frametop into `~/frametop` and runs its installer. The first run downloads 1–2 GB. The installer asks a few questions (gaze mode, the eye tracker, the Bluetooth fixes); the defaults are fine. At the end SteamVR restarts, which closes Konsole. If Frametop is already installed, this updates it.
+
+## 2. Install the Hand Recorder
+
+After SteamVR restarts, choose Launch a program → Desktop again, open Konsole, and run:
+
+```
+~/frametop/hands/rec/install.sh
+```
+
+This builds the camera broker, the hand tracker and the headset panel (the first build takes a few minutes), asks for your `sudo` password once to let the camera broker read the cameras, and adds Frametop Hand Recorder to the application menu.
+
+## 3. Record
+
+Open Frametop Hand Recorder from the desktop's application menu. It walks you through the consent text, a short checklist, the recording, a review of what you recorded, and the upload to Hugging Face. Nothing leaves the headset until you press Upload.
+
+## Update
+
+```
+curl -fsSL https://deejanuz.github.io/frametop/get.sh | bash -s -- --stable
+~/frametop/hands/rec/install.sh
+```
+
+Run the second command after SteamVR has restarted, as in the install.
+
+## Uninstall
+
+```
+~/frametop/hands/rec/install.sh uninstall
+```
+
+This removes the menu entry. Your recordings stay in `~/.local/share/frametop/hands/contrib`; delete that folder to remove them. To remove Frametop as well, follow [Uninstall](https://github.com/DeeJanuz/frametop#uninstall) in the README.
+
+## Help
+
+Ask in the [Frametop Discord](https://discord.gg/W3X9f7z3Bc), the [Frametop issues](https://github.com/DeeJanuz/frametop/issues), or the dataset's [discussion page](https://huggingface.co/datasets/DeeJanuz/frametop-hands/discussions). All three are public.