chore(android): record v1.0.8 build 51

AAB sha256 4893ee6f64f90bb1b2e1f13c6b088cbe75103337fbc101751da7076224778c29
verified: com.sauci.app 1.0.8 (51), production upload key, four ABIs,
Worklets/Reanimated/Skia libraries, no broad media read permissions,
production OTA endpoint, channel, and code-signing certificate. Supersedes
the build 50 artifact, which predated the skia 2.6.9 bump and the
expo-av migration and was quarantined unshipped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/release-notes.md

@@ -1,7 +1,7 @@
 # Sauci Mobile Release Notes
 
 ## v1.0.8 - 31 August 2026
-_Android build pending rebuild from final source - iOS build 47_
+_Android build 51 - iOS build 47_
 
 A quieter release that makes everything you do together feel steadier.