diff --git a/.github/scripts/resolve-demo-runtime-profile.sh b/.github/scripts/resolve-demo-runtime-profile.sh
index 790a7695be..fb5ad14163 100755
--- a/.github/scripts/resolve-demo-runtime-profile.sh
+++ b/.github/scripts/resolve-demo-runtime-profile.sh
@@ -14,9 +14,12 @@ git rev-parse -q --verify "${TAG_REF}^{commit}" >/dev/null || {
 
 # Reusable workflows execute from the caller revision, while the installed
 # binary comes from TAG_REF. The large-estate profile is safe only when that
-# exact runtime implements both required scaling boundaries.
+# exact runtime implements both scaling boundaries and carries an explicit
+# startup-readiness marker earned by the complete governed profile. Source
+# structure alone is not proof that health becomes responsive at that scale.
 if git grep -q 'mockEagerHistoryPVEGuestLimit' "${TAG_REF}" -- internal/monitoring/mock_metrics_history.go && \
-   git grep -q 'UpdateMetricCohort' "${TAG_REF}" -- internal/mock/integration.go; then
+   git grep -q 'UpdateMetricCohort' "${TAG_REF}" -- internal/mock/integration.go && \
+   git grep -q 'mockLargeEstateStartupReady' "${TAG_REF}" -- internal/monitoring/mock_metrics_history.go; then
   PROFILE="large-estate"
   MOCK_NODES=50
   MOCK_VMS_PER_NODE=10
diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index 75af16cd6c..08e1e682d2 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -2023,6 +2023,21 @@ release-note screenshots referenced by the validated body, and reject every
 unreferenced asset. Recovery remains activation-only and may not rebuild or
 replace the qualified candidate.
 
+Activation recovery run `33227705135` published stable `v6.4.0` and bound
+customer convergence to run `33227719830`. Docker aliases, Helm Pages, and the
+paid-runtime broker converged, but the stable demo's large-estate restore left
+the v6.4.0 process unresponsive and the public health endpoint unavailable.
+The convergence owner was cancelled after the restore exceeded its bounded
+health window; its global promotion lease released successfully. Dedicated
+demo recovery run `33228777096` reproduced the failure with the exact installed
+binary and unit, preserved the Relay process, restored the prior runtime
+configuration, and compensated by stopping only `pulse.service`. A tagged
+runtime may therefore enter the 50-node, 48-hour-seed public demo profile only
+when it carries an explicit `mockLargeEstateStartupReady` marker earned by that
+complete startup and browser proof. The eager-history and update-cohort source
+markers remain necessary but are not sufficient. Runtimes without the explicit
+proof marker use the governed 8-node, two-hour-seed legacy-bounded profile.
+
 The preceding `v6.4.0-rc.8` qualification attempt used exact source SHA
 `bac7e5d9526d76a6b4e34738511b07609dda80ed`. Release run `33128595650`
 passed preparation, frontend bundle, Windows installer smoke, release smoke,
diff --git a/scripts/installtests/build_release_assets_test.go b/scripts/installtests/build_release_assets_test.go
index c567586ee6..4277f1d4b6 100644
--- a/scripts/installtests/build_release_assets_test.go
+++ b/scripts/installtests/build_release_assets_test.go
@@ -1839,6 +1839,7 @@ func TestUpdateDemoWorkflowUsesGovernedNetworkPath(t *testing.T) {
 		`Resolve target-compatible demo runtime profile`,
 		`git grep -q 'mockEagerHistoryPVEGuestLimit'`,
 		`git grep -q 'UpdateMetricCohort'`,
+		`git grep -q 'mockLargeEstateStartupReady'`,
 		`PROFILE="large-estate"`,
 		`MOCK_NODES=50`,
 		`MOCK_VMS_PER_NODE=10`,
diff --git a/scripts/release_control/release_promotion_policy_test.py b/scripts/release_control/release_promotion_policy_test.py
index a874db4d5d..37832d20ab 100644
--- a/scripts/release_control/release_promotion_policy_test.py
+++ b/scripts/release_control/release_promotion_policy_test.py
@@ -1943,6 +1943,7 @@ class ReleasePromotionPolicyTest(unittest.TestCase):
         self.assertIn("Resolve target-compatible demo runtime profile", demo)
         self.assertIn("mockEagerHistoryPVEGuestLimit", demo_profile)
         self.assertIn("UpdateMetricCohort", demo_profile)
+        self.assertIn("mockLargeEstateStartupReady", demo_profile)
         self.assertIn('PROFILE="legacy-bounded"', demo_profile)
         self.assertIn("MOCK_NODES=8", demo_profile)
         self.assertIn("MOCK_VMS_PER_NODE=6", demo_profile)