diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 09ddb4e8fb..e00ff0c8fb 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -16,14 +16,12 @@ on:
 permissions:
   contents: read
 
-# Let the in-progress run finish (pushes land here every few minutes on a
-# busy day, and cancelling would mean main never completes a verdict — four
-# consecutive runs were cancelled on 2026-07-17 alone); queued runs collapse
-# to the newest pending one, so intermediate pushes skip. Mirrors the Core
-# E2E workflow's concurrency policy.
+# Let branch runs finish so busy main and release branches retain verdicts.
+# A newer PR commit supersedes its previous validation, so do not queue the
+# replacement behind obsolete checks. Keep this aligned with Core E2E.
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: false
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
   secret-scan:
diff --git a/.github/workflows/test-e2e.yml b/.github/workflows/test-e2e.yml
index 0ea3c97fff..652dede6cf 100644
--- a/.github/workflows/test-e2e.yml
+++ b/.github/workflows/test-e2e.yml
@@ -26,12 +26,12 @@ on:
       - '.github/workflows/test-e2e.yml'
   workflow_dispatch:
 
-# Let the in-progress run finish (pushes land here every few minutes, and
-# cancelling would mean a busy main never completes a verdict); queued runs
-# collapse to the newest pending one, so intermediate pushes skip.
+# Let branch runs finish so busy main and release branches retain verdicts.
+# A newer PR commit supersedes its previous validation, so do not queue the
+# replacement behind obsolete checks. Keep this aligned with Build and Test.
 concurrency:
   group: e2e-${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: false
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 permissions:
   contents: read
diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index c4b1ef4130..3b3b28bed7 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -15,6 +15,15 @@
 
 ## Purpose
 
+### Superseded pull request validation
+
+Build and Test and Core E2E cancel an older run for the same pull request when
+a newer commit starts validation. Branch pushes and manual dispatches retain
+their in-progress runs, so busy main and release branches still finish verdicts.
+Concurrency groups continue to isolate workflows and refs. Cancellation of an
+obsolete PR run supplies no passing evidence for its replacement, which still
+needs its own checks. Release publication workflows are unaffected.
+
 ### Docker SDK dependency compatibility
 
 The Docker consumers use Moby API v1.56.0 and client v0.6.0 together, without