enhance bug-fix workflow and add unit-test-scope knowledge

[c2thorn]

This PR enhances the bug-fix workflow and knowledge base with three improvements:

1. make HITL steering pauses CRITICAL
2. Bug-fix repro guidance
3. Unit Test Scope knowledge entry

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 563dc0a:

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit feeb86f:

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 76ce798:

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 0e91c7b:

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