Add CI workflow that builds and runs the test/bugs harness

Adds .github/workflows/bugs.yml, which configures, builds, and runs
test/bugs (linked against the local src/). The harness exits non-zero on
any failed check, so regressions in the fixed timing/serial/stream
behaviour now fail CI. Also adds a matching status badge to the README.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FAsvzgsaayj2nbZnnQGAav

.github/workflows/bugs.yml

@@ -0,0 +1,34 @@
+name: bugs
+
+on: [push]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Debug
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Create Build Environment
+      run: cmake -E make_directory ${{github.workspace}}/test/bugs/build
+
+    - name: Configure CMake
+      shell: bash
+      working-directory: ${{github.workspace}}/test/bugs/build
+      run: cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build
+      working-directory: ${{github.workspace}}/test/bugs/build
+      shell: bash
+      run: cmake --build . --config $BUILD_TYPE
+
+    - name: Run tests
+      working-directory: ${{github.workspace}}/test/bugs/build
+      shell: bash
+      # The harness exits non-zero if any check fails. stdin is redirected
+      # from /dev/null so the console/keyboard paths are deterministic in CI.
+      run: ./bugs < /dev/null

README.md

@@ -3,6 +3,7 @@
 [![blink](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/blink.yml/badge.svg)](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/blink.yml)
 [![first](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/first.yml/badge.svg)](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/first.yml)
 [![root](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/root.yml/badge.svg)](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/root.yml)
+[![bugs](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/bugs.yml/badge.svg)](https://github.com/newdigate/teensy-x86-stubs/actions/workflows/bugs.yml)
 
 stub classes implementing basic arduino/teensy functions for compiling and debugging on your x86/x64 architecture (Linux, macOS, Windows/MSVC)