feat: execute durable client commands through supervisor

scripts/test-e2e

@@ -1,6 +1,12 @@
 #!/bin/sh
 set -eu
 
-echo "E2E requires the production server plus a native Windows host; that host is currently unavailable" >&2
-exit 2
+repo_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
 
+# The deterministic protocol E2E lane runs in the pinned toolchain container.
+# A native Windows run is opt-in and is driven by the checked-in PowerShell
+# host adapter; it must acquire its VM lease and reset the exact fixture before
+# mutating it. No guest password is accepted on this command line.
+cd "$repo_root"
+exec docker compose -f deploy/compose.yaml run --rm toolchain \
+  go run ./test/harness e2e "$@"