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Fix guardrails example and add GH diagnostics #187

Job	Run time
Detect changed areas	5s
CI results (required)	4s
Format / etc	0s
cargo shear	0s
Tests — ${{ matrix.runner }} - ${{ matrix.target }}	0s
Lint/Build — ${{ matrix.runner }} - ${{ matrix.target }}${{ (((matrix.profile == 'release') && ' (release)') \|\| '') }}	0s
	9s