docs: add managed Android infrastructure setup

[MohabMohie]

Summary

• document the provider-backed MOBILE_ANDROID setup, exact pins, explicit license approval, platform prerequisites, cache/offline rules, and owned lifecycle recovery
• document shared MCP ownership and receipt-bound engine bootstrap, including explicit-remote precedence and child-only environment
• add a mutation-sensitive docs contract for the recurring CLI commands and public behavior
• restore the canonical social-card RGBA format required by the existing repository contract after the latest base image optimization changed it to RGB

Companion documentation for ShaftHQ/SHAFT_ENGINE#4898 and engine PRs ShaftHQ/SHAFT_ENGINE#4913 and ShaftHQ/SHAFT_ENGINE#4917.

Verification

• node tests/android-infrastructure-docs.test.js
• yarn test:docs
• yarn test
• yarn typecheck
• yarn build
• local yarn test:playwright reached no assertions because the required Chromium revision is absent; the PR gate installs Chromium and provides the rendered browser evidence

Graphify refresh is intentionally skipped under the session's explicit no-Graphify constraint. The repository's Graphify maintenance contract still passed as part of yarn test.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	shaft-engine	3765578	Commit Preview URL Branch Preview URL	Aug 14 2026, 06:22 AM