diff --git a/docs/release-control/v6/internal/HIGH_RISK_RELEASE_VERIFICATION_MATRIX.md b/docs/release-control/v6/internal/HIGH_RISK_RELEASE_VERIFICATION_MATRIX.md
index 362febb89..5c28ab884 100644
--- a/docs/release-control/v6/internal/HIGH_RISK_RELEASE_VERIFICATION_MATRIX.md
+++ b/docs/release-control/v6/internal/HIGH_RISK_RELEASE_VERIFICATION_MATRIX.md
@@ -96,6 +96,7 @@ Companion drill:
   `go test ./internal/hosted/... -count=1`
   `go test ./internal/api -run 'TestHostedLifecycle|TestHostedOrgAdminHandlers|TestHostedSignupSuccess|TestHostedSignupValidationFailures|TestHostedSignupHostedModeGate|TestHostedSignupRateLimit|TestHostedSignupRateLimit_NoProvisioningSideEffects|TestHostedSignupCleanupOnRBACFailure|TestHostedSignupFailsClosedWithoutPublicURL|TestStripeWebhook_' -count=1`
   `cd frontend-modern && npx vitest run src/pages/__tests__/HostedSignup.test.tsx src/components/Settings/__tests__/BillingAdminPanel.test.tsx src/components/Settings/__tests__/OrganizationBillingPanel.test.tsx`
+  `EXPECT_PUBLIC_SIGNUP_ENABLED=false scripts/run_cloud_public_signup_smoke.sh` while public signup is intentionally closed, or `EXPECT_PUBLIC_SIGNUP_ENABLED=true scripts/run_cloud_public_signup_smoke.sh` during the GA launch window when public signup is expected to be live.
 - Manual scenario:
   1. Start from a real hosted Pulse signup or an existing hosted tenant.
   2. Confirm the user can authenticate into the hosted Pulse app and reach a
diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index 786183b35..60bbdea95 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -68,26 +68,27 @@ server-side update execution surfaces.
 46. `scripts/release_control/release_promotion_policy_support.py`
 47. `scripts/release_control/resolve_release_promotion.py`
 48. `scripts/release_ldflags.sh`
-49. `scripts/run_demo_public_browser_smoke.sh`
-50. `scripts/demo_public_browser_smoke.cjs`
-51. `scripts/run_hosted_staging_smoke.sh`
-52. `scripts/trigger-release-dry-run.sh`
-53. `scripts/trigger-release.sh`
-54. `scripts/toggle-mock.sh`
-55. `deploy/helm/pulse/`
-56. `tests/integration/playwright.config.ts`
-57. `tests/integration/QUICK_START.md`
-58. `tests/integration/README.md`
-59. `tests/integration/scripts/bootstrap-hosted-mobile-onboarding.mjs`
-60. `tests/integration/scripts/hosted-mobile-token-runtime.mjs`
-61. `tests/integration/scripts/hosted-tenant-runtime.mjs`
-62. `tests/integration/scripts/managed-dev-runtime.mjs`
-63. `tests/integration/scripts/relay-mobile-token-helper.go`
-64. `tests/integration/tests/helpers.ts`
-65. `tests/integration/tests/runtime-defaults.ts`
-66. `docker-compose.yml`
-67. `scripts/install-docker.sh`
-68. `scripts/validate-published-release.sh`
+49. `scripts/run_cloud_public_signup_smoke.sh`
+50. `scripts/run_demo_public_browser_smoke.sh`
+51. `scripts/demo_public_browser_smoke.cjs`
+52. `scripts/run_hosted_staging_smoke.sh`
+53. `scripts/trigger-release-dry-run.sh`
+54. `scripts/trigger-release.sh`
+55. `scripts/toggle-mock.sh`
+56. `deploy/helm/pulse/`
+57. `tests/integration/playwright.config.ts`
+58. `tests/integration/QUICK_START.md`
+59. `tests/integration/README.md`
+60. `tests/integration/scripts/bootstrap-hosted-mobile-onboarding.mjs`
+61. `tests/integration/scripts/hosted-mobile-token-runtime.mjs`
+62. `tests/integration/scripts/hosted-tenant-runtime.mjs`
+63. `tests/integration/scripts/managed-dev-runtime.mjs`
+64. `tests/integration/scripts/relay-mobile-token-helper.go`
+65. `tests/integration/tests/helpers.ts`
+66. `tests/integration/tests/runtime-defaults.ts`
+67. `docker-compose.yml`
+68. `scripts/install-docker.sh`
+69. `scripts/validate-published-release.sh`
 69. `scripts/validate-release.sh`
 70. `scripts/release_asset_common.sh`
 71. `scripts/backfill-release-assets.sh`
@@ -174,8 +175,13 @@ server-side update execution surfaces.
    External helper binaries fetched by governed release workflows are part of
    the same supply-chain boundary and must be checksum-verified before they are
    executed.
-8. Add or change operator-facing hosted tenant runtime canary rollout, batch runtime contract reconciliation, canonical hosted route/public URL generation, or control-plane runtime-registry reconciliation through `cmd/pulse-control-plane/main.go`, `internal/cloudcp/docker/manager.go`, `internal/cloudcp/docker/labels.go`, and `internal/cloudcp/tenant_runtime_rollout.go`
-9. Add or change the canonical hosted staging smoke operator path through `scripts/run_hosted_staging_smoke.sh`, `tests/integration/scripts/bootstrap-hosted-mobile-onboarding.mjs`, `tests/integration/scripts/hosted-mobile-token-runtime.mjs`, `tests/integration/scripts/hosted-tenant-runtime.mjs`, and `tests/integration/scripts/relay-mobile-token-helper.go`
+8. Add or change the non-secret Pulse Cloud public signup route smoke through
+   `scripts/run_cloud_public_signup_smoke.sh`. That smoke must prove either
+   the open signup route contract or the intentionally closed redirect contract,
+   and valid magic-link probes must remain opt-in so routine public checks do
+   not send email accidentally.
+9. Add or change operator-facing hosted tenant runtime canary rollout, batch runtime contract reconciliation, canonical hosted route/public URL generation, or control-plane runtime-registry reconciliation through `cmd/pulse-control-plane/main.go`, `internal/cloudcp/docker/manager.go`, `internal/cloudcp/docker/labels.go`, and `internal/cloudcp/tenant_runtime_rollout.go`
+10. Add or change the canonical hosted staging smoke operator path through `scripts/run_hosted_staging_smoke.sh`, `tests/integration/scripts/bootstrap-hosted-mobile-onboarding.mjs`, `tests/integration/scripts/hosted-mobile-token-runtime.mjs`, `tests/integration/scripts/hosted-tenant-runtime.mjs`, and `tests/integration/scripts/relay-mobile-token-helper.go`
 
 ## Forbidden Paths
 
diff --git a/docs/release-control/v6/internal/subsystems/registry.json b/docs/release-control/v6/internal/subsystems/registry.json
index c0e00f861..0854889c3 100644
--- a/docs/release-control/v6/internal/subsystems/registry.json
+++ b/docs/release-control/v6/internal/subsystems/registry.json
@@ -2569,6 +2569,7 @@
         "scripts/release_control/render_release_body.py",
         "scripts/release_control/resolve_release_promotion.py",
         "scripts/release_ldflags.sh",
+        "scripts/run_cloud_public_signup_smoke.sh",
         "scripts/run_demo_public_browser_smoke.sh",
         "scripts/run_hosted_staging_smoke.sh",
         "scripts/toggle-mock.sh",
@@ -2698,6 +2699,19 @@
               "scripts/installtests/release_ldflags_test.go"
             ]
           },
+          {
+            "id": "cloud-public-signup-smoke-runtime",
+            "label": "Cloud public signup smoke proof",
+            "match_prefixes": [],
+            "match_files": [
+              "scripts/run_cloud_public_signup_smoke.sh"
+            ],
+            "allow_same_subsystem_tests": false,
+            "test_prefixes": [],
+            "exact_files": [
+              "scripts/tests/test-cloud-public-signup-smoke.sh"
+            ]
+          },
           {
             "id": "demo-public-browser-smoke-runtime",
             "label": "demo public browser smoke proof",
diff --git a/scripts/run_cloud_public_signup_smoke.sh b/scripts/run_cloud_public_signup_smoke.sh
new file mode 100755
index 000000000..015dbb0d2
--- /dev/null
+++ b/scripts/run_cloud_public_signup_smoke.sh
@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DOMAIN="${DOMAIN:-cloud.pulserelay.pro}"
+PULSE_CLOUD_BASE_URL="${PULSE_CLOUD_BASE_URL:-https://${DOMAIN}}"
+EXPECT_PUBLIC_SIGNUP_ENABLED="${EXPECT_PUBLIC_SIGNUP_ENABLED:-true}"
+PUBLIC_SIGNUP_CLOSED_REDIRECT_URL="${PUBLIC_SIGNUP_CLOSED_REDIRECT_URL:-https://pulserelay.pro/}"
+CHECK_MAGIC_LINK_VALID_PROBE="${CHECK_MAGIC_LINK_VALID_PROBE:-false}"
+CURL_TIMEOUT="${CURL_TIMEOUT:-15}"
+
+BASE_URL="${PULSE_CLOUD_BASE_URL%/}"
+FAILURES=0
+
+pass() {
+  echo "[PASS] $*"
+}
+
+fail() {
+  echo "[FAIL] $*"
+  FAILURES=$((FAILURES + 1))
+}
+
+info() {
+  echo "[INFO] $*"
+}
+
+http_code() {
+  local method="$1"
+  local path="$2"
+  shift 2
+  curl -sS --max-time "${CURL_TIMEOUT}" -o /dev/null -w "%{http_code}" -X "${method}" "$@" "${BASE_URL}${path}"
+}
+
+http_status_and_redirect() {
+  local method="$1"
+  local path="$2"
+  shift 2
+  curl -sS --max-time "${CURL_TIMEOUT}" -o /dev/null -w "%{http_code} %{redirect_url}" -X "${method}" "$@" "${BASE_URL}${path}"
+}
+
+expect_code() {
+  local method="$1"
+  local path="$2"
+  local expected="$3"
+  shift 3
+  local code
+  code="$(http_code "${method}" "${path}" "$@")"
+  if [[ "${code}" == "${expected}" ]]; then
+    pass "${method} ${path} returns ${expected}"
+  else
+    fail "${method} ${path} expected ${expected}, got ${code}"
+  fi
+}
+
+expect_redirect() {
+  local method="$1"
+  local path="$2"
+  local expected_code="$3"
+  shift 3
+  local code redirect_url
+  read -r code redirect_url <<<"$(http_status_and_redirect "${method}" "${path}" "$@")"
+  if [[ "${code}" == "${expected_code}" && "${redirect_url}" == "${PUBLIC_SIGNUP_CLOSED_REDIRECT_URL}" ]]; then
+    pass "${method} ${path} returns ${expected_code} to ${PUBLIC_SIGNUP_CLOSED_REDIRECT_URL}"
+  else
+    fail "${method} ${path} expected ${expected_code} to ${PUBLIC_SIGNUP_CLOSED_REDIRECT_URL}, got ${code} to ${redirect_url:-<none>}"
+  fi
+}
+
+check_shared_public_floor() {
+  info "Checking shared public control-plane floor at ${BASE_URL}"
+  expect_code GET /healthz 200
+  expect_code GET /readyz 200
+  expect_code POST /api/stripe/webhook 400
+}
+
+check_closed_signup_contract() {
+  info "Checking intentionally closed public signup contract"
+  expect_redirect GET /signup 302
+  expect_redirect GET /cloud/signup 302
+  expect_redirect GET /signup/complete 302
+  expect_redirect GET /cloud/signup/complete 302
+  expect_redirect GET /api/public/signup 302
+  expect_redirect POST /api/public/signup 307 -H "Content-Type: application/json" --data '{"email":"not-an-email","org_name":"Acme"}'
+  expect_code POST /api/public/magic-link/request 400 -H "Content-Type: application/json" --data '{"email":"not-an-email"}'
+}
+
+check_open_signup_contract() {
+  info "Checking live public signup contract"
+  expect_code GET /signup 200
+  expect_code GET /cloud/signup 200
+  expect_code GET /signup/complete 200
+  expect_code GET /cloud/signup/complete 200
+  expect_code GET /api/public/signup 405
+  expect_code POST /api/public/signup 400 -H "Content-Type: application/json" --data '{"email":"not-an-email","org_name":"Acme"}'
+  expect_code POST /api/public/magic-link/request 400 -H "Content-Type: application/json" --data '{"email":"not-an-email"}'
+
+  if [[ "${CHECK_MAGIC_LINK_VALID_PROBE}" == "true" ]]; then
+    expect_code POST /api/public/magic-link/request 200 -H "Content-Type: application/json" --data '{"email":"owner@example.com"}'
+  else
+    info "Skipping valid magic-link probe (CHECK_MAGIC_LINK_VALID_PROBE=${CHECK_MAGIC_LINK_VALID_PROBE})"
+  fi
+}
+
+main() {
+  if ! command -v curl >/dev/null 2>&1; then
+    echo "curl is required for Pulse Cloud public signup smoke" >&2
+    exit 1
+  fi
+
+  local expected_state
+  expected_state="$(echo "${EXPECT_PUBLIC_SIGNUP_ENABLED}" | tr '[:upper:]' '[:lower:]')"
+  check_shared_public_floor
+
+  case "${expected_state}" in
+    true)
+      check_open_signup_contract
+      ;;
+    false)
+      check_closed_signup_contract
+      ;;
+    *)
+      fail "EXPECT_PUBLIC_SIGNUP_ENABLED must be true or false (got '${EXPECT_PUBLIC_SIGNUP_ENABLED}')"
+      ;;
+  esac
+
+  echo
+  echo "Summary: failures=${FAILURES}"
+  if (( FAILURES > 0 )); then
+    exit 1
+  fi
+}
+
+main "$@"
diff --git a/scripts/tests/test-cloud-public-signup-smoke.sh b/scripts/tests/test-cloud-public-signup-smoke.sh
new file mode 100755
index 000000000..7127bea31
--- /dev/null
+++ b/scripts/tests/test-cloud-public-signup-smoke.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+SMOKE="${ROOT_DIR}/scripts/run_cloud_public_signup_smoke.sh"
+
+bash -n "${SMOKE}"
+
+grep -q 'EXPECT_PUBLIC_SIGNUP_ENABLED' "${SMOKE}"
+grep -q 'PUBLIC_SIGNUP_CLOSED_REDIRECT_URL' "${SMOKE}"
+grep -q 'CHECK_MAGIC_LINK_VALID_PROBE' "${SMOKE}"
+grep -q 'check_closed_signup_contract' "${SMOKE}"
+grep -q 'check_open_signup_contract' "${SMOKE}"
+
+echo "cloud public signup smoke checks passed"