fix(deploy): align vector bootstrap identity policy

scripts/test-vector-secret-policy.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+set -eu
+
+cd "$(dirname "$0")/.."
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT HUP INT TERM
+
+. ./deploy/vector/secret-policy.sh
+
+: >"$tmp/empty"
+printf 'has newline\n' >"$tmp/newline"
+printf 'has space' >"$tmp/space"
+printf 'safe-quoted-\047-dollar-$' >"$tmp/valid"
+
+for invalid in empty newline space; do
+  if validate_secret_file "$tmp/$invalid" "$invalid" >/dev/null 2>&1; then
+    echo "secret policy accepted $invalid" >&2
+    exit 1
+  fi
+done
+validate_secret_file "$tmp/valid" valid
+test "$(read_secret_file "$tmp/valid" valid)" = "safe-quoted-'-dollar-$"
+
+echo "shared vector secret policy contracts passed."