Validation: Add make verify-fast and make verify

[robbycochran]

Summary

Add two new verification targets to the Makefile that do not require Docker, Kind, or OpenShell:

• make verify-fast: Quick verification with vet + lint (basic code quality checks)
• make verify: Full verification with vet + lint + test-suite (includes configuration test suite)

Validation

Both targets validated:

• make verify-fast passes
• make verify passes with full test-suite output

Files Changed

• Makefile: Added verify-fast and verify targets, updated .PHONY targets list

Risks

None - purely additive, no breaking changes to existing targets.

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[robbycochran]

Superseded by #136, which consolidates this change (and the other three batch drafts) into a single PR against main.