chore(docs): add downstream task evidence runbook artifacts
This commit consolidates operational documentation and runbooks used to drive task execution and release validation. It includes evidence writeups, caveat/matrix references, release gate outputs, plan/notepad context, and generated SDP fixture needed for reproducible downstream review, keeping them separate from code and generated artifacts. This separation lets runtime and harness changes be reviewed as implementation units while process documentation remains in an independent governance/history commit. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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