test(pi): arm delayed prompt proof explicitly

.project-docs/30-worklog/tasks/20260825-pi-background-run-lease-6a4e2c91.md

@@ -197,6 +197,13 @@ Follow-up plan from cumulative HEAD `621ebb17810394f6f7b97154cb01217bc9112857`:
   Authenticode, and zero-residual-process results are completed after the task
   documentation/registry commit so the returned artifact binds to a clean
   cumulative HEAD.
+- The first candidate packaged proof intentionally required
+  `CODING_REQUEST_UNCERTAIN` but the controlled Provider's message-shape
+  matcher did not arm the delay; diagnostics showed both runs, both Main
+  leases, both Pi processes, and both Provider requests still active with no
+  runtime failure. The proof was corrected to arm prompt and compact delay
+  explicitly through E2E-only Main seams, removing message-shape dependence;
+  this was a proof-wiring failure, not a product fallback or relaxed gate.
 
 - `pnpm install --frozen-lockfile` — passed with package-manager-pinned pnpm
   `10.33.4` and locked Pi `0.84.2`.