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/build-logic/src/main/kotlin/se/hagstedt/kvitt/buildlogic/ArchitecturePlugin.kt

@@ -7,7 +7,7 @@ import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.plugins.BasePlugin
 import org.gradle.language.base.plugins.LifecycleBasePlugin
 
-/** Registers `architectureCheck` in every module and makes `check` depend on it (SPEC §6.2, owned by M2b). */
+/** Registers `architectureCheck` in every module and makes `check` depend on it (SPEC §6.2). */
 class ArchitecturePlugin : Plugin<Project> {
     override fun apply(target: Project) {
         with(target) {