Document the published KinogoATV 0.6.0 release

[reziarlleh]

Updates the complete release-facing documentation after publishing v0.6.0.

Recorded evidence includes:

• exact stable-signed APK and R8 mapping hashes;
• PR/main clean-clone CI, including the fail-closed Linux AAPT2 checksum regression and guard;
• annotated tag and regular GitHub Release;
• signed manifest PR, Android CI, Pages deployment, and exact-byte live transport checks;
• authorized KIVI Android TV 14 0.5.5 → 0.6.0 install/startup/basic D-pad smoke;
• explicit remaining boundary for playback/media-key/source-refresh and in-app installer runtime.

Documentation consistency checks:

• git diff --check: PASS
• project-local Markdown links: PASS