perf(capture): add SceneLens GPU streams and retained scene reuse

Use persistent privacy-filtered capture targets and client-owned GPU buffers with fence completion, backpressure, negotiated frame rates and shared-memory fallback.

Invalidate output views on scene changes while preserving inactive-window callbacks and capture revocation. Include OBS memory-mask negotiation and native pixel, transport and recording regressions.

.github/workflows/workspace-checks.yml

@@ -24,7 +24,7 @@ jobs:
           sudo apt-get install -y build-essential pkg-config dbus-daemon libwayland-dev \
             libxkbcommon-dev xkb-data libinput-dev libudev-dev libseat-dev libgbm-dev \
             python3-gi python3-pil libegl-dev libegl-mesa0 libgl1-mesa-dri mesa-vulkan-drivers libdrm-dev libfontconfig1-dev libfreetype-dev libexpat1-dev xauth \
-            clang libclang-dev libpipewire-0.3-dev libspa-0.2-dev libglib2.0-dev libgstreamer1.0-dev libpam-modules
+            clang libclang-dev libpipewire-0.3-dev libspa-0.2-dev libglib2.0-dev libgstreamer1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-good libpam-modules
       - name: Create private test runtime directory
         run: install -d -m 0700 "$XDG_RUNTIME_DIR"
       - name: Install Rust
@@ -60,6 +60,9 @@ jobs:
           cargo +1.95.0 test --locked -p ferese state::capture_privacy::tests -- --ignored --nocapture
           cargo +1.95.0 test --locked -p ferese backends::direct::capture::tests::capture_recomposes_cursor_without_touching_the_display_target -- --ignored --nocapture
           cargo +1.95.0 test --locked -p ferese winit::tests::capture_failure_restores_display_target_and_subsequent_frames_render -- --ignored --nocapture
+          cargo +1.95.0 test --locked -p ferese render::capture::stream_gpu_tests -- --ignored --nocapture
+      - name: Preserve static recording duration
+        run: cargo +1.95.0 test --locked -p xdg-desktop-portal-ferese --bin ferese-record recorder::tests::encoder_preserves_the_duration_of_a_static_capture -- --ignored --nocapture
       - name: Share desktop binaries with native checks
         uses: actions/upload-artifact@v7
         with: