- Add vault_documents.chat_id + composite index (migration 000056)
- Filter vault_search by chat_id when team.workspace_scope=isolated
- Stamp chat_id on AfterWrite/AfterWriteMedia for isolated teams
- Deny cross-chat vault_read in isolated teams (M2 fix)
- RunContext.TeamIsolated flag resolved once per run
- Fallback WorkspaceChatID → ChatID in loop_context for entry points
that don't set WorkspaceChatID explicitly (WS direct, HTTP, cron)
Fixes cross-chat doc leak where agent in chat A could see vault docs
from chat B within the same isolated team.
