fix: address promotion PR #14 review findings

[BeforeLights]

Addresses the single CodeRabbit review on promotion PR #14 through three reversible commits.\n\n- closes Android sync revocation, scheduling, queue ordering/cleanup, Keystore IV, and WorkManager initialization gaps\n- strengthens saved-state, account/workspace isolation, XML boundary, and revocation tests\n- records the PR #14 review disposition and refreshes the feature checkpoint\n\nValidation: Android unit/compile and connected instrumentation (3/3), corepack pnpm repo:check, repo:build, infra:check, and git diff --check.\n\nThe kapt→KSP suggestion was reproduced and rejected because the alias fails this repository's Gradle classpath configuration; the docstring warning is advisory and documented.

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