Android overhaul: stale comments and the module README

* Milestone and ownership notes that no longer hold ("owned by M5/M6/M8", "M8 replaces it", "(M8b)", "M7x add",
  "proposed decision in the M5 report", which is D-027 and D-028) in build scripts, :core:design, :core:fakes, :data,
  :app, :core:model and the settings string files.
* SyncEngine: the clock_skew KDoc sat orphaned above restampAfterClockSkew's; it now documents renewMutationId.
* libs.versions.toml header: no milestone, the drift date.
* README: the module table as built (no owners, no DebugFakesModule, which M8 removed), the test fixtures in the
  architecture check and the shared screenshot harness.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

android/feature/settings/src/main/res/values/strings.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Strings of :feature:settings (M7f), keys from docs/ux/strings.csv (module=settings). Generated; change the CSV
+<!-- Strings of :feature:settings, keys from docs/ux/strings.csv (module=settings). Generated; change the CSV
      first. -->
 <resources>
     <string name="settings_profile_offline_banner">Needs connection. Your profile can only be changed online.</string>