Use bash shell for Lint step to ensure early failure

[adamtheturtle]

PowerShell does not fail on intermediate command failures by default. By using bash shell, we ensure that any failing command causes the step to fail immediately.

See adamtheturtle/doccmd#720 for the original learning.

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Note

CI workflow update

• In .github/workflows/lint.yml, the Lint step now runs with shell: bash (with comments explaining failure behavior) to ensure the step fails on any command error.

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