Add account browsing simulation

docs/architecture.md

@@ -66,7 +66,7 @@ SIGINT/SIGTERM abort shared loops, stop account runtimes, stop the web server, c
 - verified Reddit and Matrix identity;
 - persistent Playwright browser profile;
 - posts, messages, outcomes, activity, outbox, and conversation state repositories;
-- growth settings, community list, comment history, and adaptive comment allowance;
+- growth settings, community list, comment history, adaptive comment allowance, and isolated browsing-simulation policy/audit;
 - Matrix chat cache and sync cursor;
 - media index and files;
 - rate limiter and invitation cooldown;
@@ -137,6 +137,7 @@ docs/                          Maintainer and agent documentation
 - Shared operator media: keep it under `MediaLibraryService`/`MediaLibraryRepository`; never merge it with account-owned received media.
 - New account behavior: place it in the account runtime or a service injected into it; do not add mutable cross-account identity to a singleton.
 - New account-growth behavior: keep it account-scoped and lowest-priority, fail closed before anything is published, and make every outcome visible in the growth audit trail.
+- Simulation-only account behavior: keep the decision sink separate from Reddit transports so future remote-write authority cannot appear as a hidden setting.
 - New candidate stage: make transitions durable and idempotent, expose counts/reasons, and define lease/retry behavior.
 - New dashboard feature: add a feature slice and route, use shared schemas and query keys, and treat HTTP as authoritative.