[KDM-CLI-FIX-321] fix: return non-zero on config set errors

[Akanshagore]

Summary

• Set exit code to 1 when kdm config set fails.
• Clarify that SMTP passwords must be provided through KDM_SMTP_PASSWORD.
• Update the SMTP setup guide accordingly.

Testing

• npm run build passes.
• Verified that invalid config values report an error.

Fixes #263

[coderabbitai]

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• src/commands/config.ts

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Validation error: Invalid input: expected string, received undefined at "reviews.path_instructions[3].path"; Invalid input: expected string, received undefined at "reviews.path_instructions[3].instructions"

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[utkarsh232005]

Looks good! The changes accurately address Issue #263:

• Properly sets process.exitCode = 1 when an error is caught during kdm config set, ensuring CI/CD scripts fail as expected.
• Updates the note in kdm config list (and the setup guide) to clarify that SMTP passwords must be supplied via KDM_SMTP_PASSWORD.

LGTM!

[codescene-delta-analysis]

Gates Passed
3 Quality Gates Passed

See analysis details in CodeScene

Quality Gate Profile: The Bare Minimum
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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/commands/config.ts	60.00%	2 Missing ⚠️

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