Follow up on the daily-gate harness audit with comments and a docstring only; no executable code changes.\n\nThe explanatory comment above the post-repair assertions described the real sense-repair pre-phase. The test now simulates that side effect in-process, so the prose is corrected to say so and to point at the focused data-state, sense, and describe-promote tests as the proof of the real re-entry path.\n\n_IsolationBreach gains a docstring recording why its base is BaseException: run_bounded_phase catches bare Exception, so narrowing the base would silently restore the bypass this sentinel exists to catch.