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Add the app side of Android App Links (M9 follow-up, docs/android/APP_LINKS.md), layered on the M9 Part 2 native SSO callback: - Build-time `appLinkHost` Gradle property -> BuildConfig.APP_LINK_HOST + manifestPlaceholders["appLinkHost"]. autoVerify needs a literal host, so the generic multi-tenant build leaves it empty (placeholder falls back to the reserved runic-gateway.invalid sentinel, making the filter inert); a white-label build bakes one host with -PappLinkHost=play.myshard.com. - Manifest: an autoVerify https `/mobile/callback` intent-filter beside the unchanged custom-scheme one (the permanent fallback). - SsoAuthManager: request the https App Link redirect_uri iff the baked host matches the paired shard host; matchesAppLinkCallback() enforces a paired-host trust check (host must equal the currently-paired base URL host) as defense-in-depth. Both matchers feed the same complete()/exchange path. - MainActivity routes custom-scheme and App Link callbacks identically. +5 JVM tests (SsoAuthManagerTest -> 14). Built green (JDK 21, -Pksp.incremental=false); white-label host substitution verified in the merged manifest. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NgyHnrNa8WwG3doxvxjuCr