[stealth 10/11] docs: add stealth QA release policy

[reflog]

Summary

• Add the Stealth Android QA detection matrix and release policy.
• Document static CI checks, dynamic Android validation, hostile app expectations, package rotation, manual updates, support mapping, rollback, and acceptance criteria.
• Clarify that this policy depends on companion implementation and CI PRs before it can serve as a release gate.

Validation

• git diff --cached --check
• git diff --check

Refs getlantern/engineering#3576

[Copilot]

Pull request overview

Adds a new documentation page defining QA, release, support, and rollback policy for Android stealth build profiles.

Changes:

• Documents normal, stealth-vpn, and stealth-novpn profile expectations.
• Adds static CI, dynamic Android validation, hostile-app detection, package rotation, manual update, support mapping, and acceptance criteria guidance.
• Captures direct-distribution and private-profile support requirements.

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[reflog]

Superseded — the 11 per-issue stealth PRs were consolidated into a 6-PR stack for epic getlantern/engineering#3569. This work now lives in #8864.