stress-test-ray-exomem

Drive ray-exomem end-to-end through MCP + a pair of isolated browser contexts, exercise every write/read surface, explicit branch params and branch-aware UI, sessions, attribution, bitemporal facts, typed values, fork lineage, co-edit/solo-edit mode flips, error surface, and cross-user permission. Produces a single pass/fail matrix. Use when the user says "stress test ray-exomem" / "regression-check exomem" / "/stress-test-ray-exomem", or after any change touching brain.rs / storage.rs / mcp.rs / server.rs / auth/access.rs / exom.rs / scaffold.rs / ui (sidebar/exom-view) / Rayfall AST.