docs: add QA onboarding checklist

[J4h5u5]

Summary

Add a dedicated QA onboarding checklist for new technical/QA engineers in docs/qa-onboarding-checklist.md.

What It Covers

• environment/bootstrap sanity checks
• core baseline checks (engine, CLI, docs)
• paper API smoke expectations
• safety-critical regression slice
• MCP + privacy verification
• public PR review workflow with severity levels
• fast invariant audit points
• escalation rules and reporting fields

Why

The repo has strong safety and contract rules, but new QA contributors benefit from a single repeatable checklist that maps those rules to concrete commands and expected outcomes.

Safety Impact

Documentation-only change. No runtime, API, or execution behavior changes.

AI Assistance

This docs update was materially authored with coding-agent assistance and manually reviewed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6b30f252-e185-42bb-9ca8-fabeb1246fe6

📥 Commits

Reviewing files that changed from the base of the PR and between 53457b3 and 81418ac.

📒 Files selected for processing (1)

• docs/qa-onboarding-checklist.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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