Codex/stage4 ci stabilization

.github/workflows/application.yml

@@ -27,6 +27,9 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
+      - name: Checkout ImGui headers for the ABI check
+        working-directory: .
+        run: git submodule update --init --depth 1 -- packages/dear-imgui/cpp/deps/imgui
       - uses: actions/setup-node@v4
         with:
           node-version: 24.14.0
@@ -74,7 +77,7 @@ jobs:
       - if: runner.os == 'Linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y ninja-build build-essential libgl1-mesa-dev xorg-dev libwayland-dev libxkbcommon-dev autoconf automake autoconf-archive libtool nasm bison flex pkg-config xvfb mesa-utils xdotool openbox wmctrl
+          sudo apt-get install -y ninja-build build-essential libgl1-mesa-dev xorg-dev libwayland-dev libxkbcommon-dev autoconf automake autoconf-archive libtool nasm bison flex pkg-config xvfb xauth x11-utils mesa-utils xdotool openbox wmctrl
       - run: npm ci --ignore-scripts
       - run: npm run build:common
       - name: VS2022 native unit build and all tests

README.md

@@ -43,6 +43,7 @@ XFrames is actively maintained. The current focus is technical visualization and
 
 - [Project roadmap](ROADMAP.md)
 - [Engineering and strategy documentation](docs/README.md)
+- [ubx-monitor application pacing and validation](docs/engineering/ubx-monitor-streaming-2026-09.md) — persisted display rates, source-owned telemetry histories and a bounded Windows streaming-cost comparison
 - [XFrames and GPUIX assessment](docs/strategy/gpuix-comparison-2026-08.md)
 - [Fabric-compatible runtime hardening design](docs/architecture/fabric-runtime-hardening.md)
 

docs/README.md

@@ -11,6 +11,15 @@ The live [xframes.dev](https://xframes.dev) website is maintained in a separate
 - [React Native Fabric Embedding](../packages/dear-imgui/npm/FABRIC_EMBEDDING.md) — implemented React Native 0.87 snapshot generation, host contract, workspace rules, upgrade procedure, Node/Wasm verification, and known gaps.
 - [Fabric-Compatible Runtime Hardening](architecture/fabric-runtime-hardening.md) — atomic Fabric commits, explicit destruction, lifecycle tests, recording/replay, invalidation-driven rendering, performance instrumentation, and automation.
 
+## Engineering and verification
+
+- [ubx-monitor UI Update Pacing and Streaming Measurements](engineering/ubx-monitor-streaming-2026-09.md) — completed bounded slice: persisted display rates, source-owned histories, production/lifetime gates and final reproduction.
+- [ubx-monitor Paired Pacing Costs](engineering/ubx-monitor-pacing-cost-2026-09.md) — all three quiet-window pairs, exact retention, publication/CPU reductions and the measured freshness tradeoff; broader framework targets remain open.
+- [ubx-monitor Ordinary Application Qualification](engineering/ubx-monitor-application-2026-09.md) — completed bounded Windows slice: current-package full-App integration, sustained synthetic telemetry across Plot/Table/Map/Canvas, connection lifecycle, cleanup and reproducible setup.
+- [Stage 4: Invalidation Scheduling](engineering/fabric-invalidation-2026-09.md) — delivered scheduler MVP, producer and lifetime boundaries, local validation, measurements, completed hosted CI stabilization and deferred qualification.
+- [Stage 3: Atomic Fabric Publication](engineering/fabric-publication-2026-09.md) — schema-v2 publication, committed ownership, visibility guarantees and historical acceptance evidence.
+- [Diagnostics and Reproduction Guide](../packages/dear-imgui/npm/diagnostics/README.md) — current fixture commands, platform prerequisites and measurement contracts.
+
 ## Existing design records
 
 - [Canvas Widget Design](../CANVAS.md) — canvas purpose, data flow, draw commands, performance model, and integration patterns.

docs/architecture/fabric-runtime-hardening.md

@@ -1,7 +1,7 @@
 # Fabric-Compatible Runtime Hardening
 
-- Status: target architecture with implemented Stage 3 publication and Stage 4 scheduling boundaries below; current acceptance evidence is tracked separately
-- Last updated: 8 September 2026
+- Status: target architecture with implemented Stage 3 publication and committed Stage 4 scheduler MVP; broader runtime qualification remains open
+- Last updated: 11 September 2026
 - Related decision: [XFrames and GPUIX assessment](../strategy/gpuix-comparison-2026-08.md)
 
 ## Purpose
@@ -60,7 +60,10 @@ schema sketches below are not the accepted publication wire spelling.
 ### Implemented Stage 4 scheduling boundary
 
 The [invalidation implementation record](../engineering/fabric-invalidation-2026-09.md)
-supersedes the scheduler sketches below. Both backends use one shared
+describes the MVP committed in `1de105f` and supersedes the scheduler sketches
+below. Its local acceptance and the successful hosted CI stabilization in
+`fa12b22` are recorded separately from the broader milestone qualification.
+Both backends use one shared
 `FrameScheduler`: a monotonic generation, one constructing ticket and one latest
 submitted ticket. Successful publication advances revision and generation under
 the tree visibility locks. Imperative/resource/input work advances generation