Android: release hygiene — Baseline Profile, ProGuard audit, versionCode automation, APK->AAB

[ahmetabdullahgultekin]

Why: Remaining Android release/distribution hygiene gaps before v6 GA.

Done when:

• Baseline Profile for cold-start < 1.5 s (gap Claude/review module plan 01 dxuc szw1wd9h n9 u9 zcdnm z #4, ~2 d).
• ProGuard rules audit for Conscrypt / AppAuth / Compose keep rules (gap Add comprehensive documentation review report #5, ~1 d).
• versionCode/versionName auto-bumped from the shared module version (gap refactor: Optimize documentation naming and organization #6, ~0.5 d).
• APK v5.x -> AAB cut-over with AAB as the Play Store canonical (gap docs: add comprehensive ADD critique report with gap analysis #7, ~1 d); cut a final frozen v5.2 APK sideload first.

source: plans/CLIENT_APPS_PARITY.md:123

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Migrated from plans/CLIENT_APPS_PARITY.md (git history retains the original).