docs: add validation guide, hardware and Windows scripts, CI

Documents what the rig proved and what it found, adds the hardware sign-off
script for the Hyprland machine and an (untested) Windows validation script,
and updates CI to build the cached OBS runtime, run tests and lint the Windows
code paths.

.gitea/workflows/checks.yml

@@ -5,20 +5,58 @@ on:
   pull_request:
 
 jobs:
-  checks:
+  linux:
     runs-on: ubuntu-latest
     steps:
       - uses: https://github.com/actions/checkout@v4
       - uses: https://github.com/dtolnay/rust-toolchain@1.98.0
         with:
           components: rustfmt, clippy
-      - name: Install native UI build dependencies
+      - name: Install native build dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y build-essential pkg-config libfontconfig1-dev libfreetype6-dev libwayland-dev libxcb1-dev libxkbcommon-dev libxkbcommon-x11-dev libssl-dev
+          # GPUI, plus clang for the libobs bindings.
+          sudo apt-get install -y build-essential pkg-config clang libfontconfig1-dev libfreetype6-dev \
+            libwayland-dev libxcb1-dev libxkbcommon-dev libxkbcommon-x11-dev libssl-dev
+          # OBS 32.0.4 libobs and the bundled plugins (scripts/obs/build-linux.sh).
+          sudo apt-get install -y cmake ninja-build extra-cmake-modules libavcodec-dev libavdevice-dev \
+            libavfilter-dev libavformat-dev libavutil-dev libswresample-dev libswscale-dev libx264-dev \
+            libcurl4-openssl-dev libmbedtls-dev libgl1-mesa-dev libglvnd-dev libgles2-mesa-dev libjansson-dev \
+            libx11-dev libx11-xcb-dev libxcb-randr0-dev libxcb-shm0-dev libxcb-xinerama0-dev \
+            libxcb-composite0-dev libxcb-xfixes0-dev libxcb-xinput-dev libxcomposite-dev libxinerama-dev \
+            libxss-dev libpci-dev libpipewire-0.3-dev libpulse-dev libudev-dev libva-dev libdrm-dev \
+            librist-dev libsrt-openssl-dev uthash-dev libsimde-dev nlohmann-json3-dev libffmpeg-nvenc-dev \
+            uuid-dev libglib2.0-dev
+      - name: Cache the OBS runtime
+        uses: https://github.com/actions/cache@v4
+        with:
+          path: target/obs-runtime/linux-x86_64
+          key: obs-runtime-linux-${{ hashFiles('scripts/obs/versions.env', 'scripts/obs/build-linux.sh') }}
+      - name: Build the OBS runtime
+        run: |
+          if [ ! -f target/obs-runtime/linux-x86_64/VERSION ]; then
+            scripts/obs/build-linux.sh
+          fi
       - name: Check formatting
         run: cargo fmt --all -- --check
-      - name: Check Rust
+      - name: Lint
         run: cargo clippy --locked --workspace --all-targets -- -D warnings
+      - name: Test
+        run: cargo test --locked --workspace
       - name: Build
         run: cargo build --locked --workspace
+
+  windows-cross-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: https://github.com/actions/checkout@v4
+      - uses: https://github.com/dtolnay/rust-toolchain@1.98.0
+        with:
+          components: clippy
+          targets: x86_64-pc-windows-msvc
+      # Type-checks the Windows code paths; nothing is linked or run. The GPUI
+      # crate needs the MSVC C toolchain and is checked on Windows instead.
+      - name: Lint Windows code paths
+        run: >
+          cargo clippy --locked --target x86_64-pc-windows-msvc
+          -p clipbin-core -p clipbin-obs -p clipbin-probe --all-targets -- -D warnings