Merge the architecture audit refactors and follow-up UX fixes: remove release notes from generated LLM context, keep author edit controls delete-only, stabilize board refresh rendering, and address review feedback for role loading, refresh holds, moderation actions, and P2P stats polling.
* fix(thread update): refresh stale reply caches
Evict the current thread comment and known reply-page cache entries before manual refresh so stale local data does not keep replies hidden. Also defer broader multiboard suggestion feeds until the current /all time window is exhausted to reduce renderer pressure.
* fix(thread update): evict alternate reply page caches
* fix(board): hide stale time-window suggestions
