feat(agent): add Kiro spec archive workflow

[matdev83]

Summary

• add /kiro-spec-archive workflow for safe Kiro spec closeout
• enforce task/completion evidence before archival
• document completion metadata, status.json convention, successor baselines, verification, PR delivery, and Windows cleanup

Verification

• make docs-check
• gofmt preflight
• go mod verify
• staged diff checks

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