diff --git a/.github/workflows/definition-of-done.yml b/.github/workflows/definition-of-done.yml
index 4e9c231..3b8245b 100644
--- a/.github/workflows/definition-of-done.yml
+++ b/.github/workflows/definition-of-done.yml
@@ -6,12 +6,17 @@ name: Definition of Done
 
 on:
   pull_request:
-    types: [opened, synchronize, reopened, edited]
+    # Drop `edited` — re-runs the gate on title/body edits without any code change.
+    types: [opened, synchronize, reopened]
 
 permissions:
   contents: read
   pull-requests: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   lint-no-mocks-in-runtime-e2e:
     name: Lint — no mocks in runtime-e2e/
diff --git a/.github/workflows/heartbeat-real-stack.yml b/.github/workflows/heartbeat-real-stack.yml
index c1a3fa2..f4e1694 100644
--- a/.github/workflows/heartbeat-real-stack.yml
+++ b/.github/workflows/heartbeat-real-stack.yml
@@ -27,6 +27,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   real-stack:
     name: Real-stack E2E (${{ matrix.os }})
diff --git a/.github/workflows/install-smoke.yml b/.github/workflows/install-smoke.yml
index 772c723..cfbf1c3 100644
--- a/.github/workflows/install-smoke.yml
+++ b/.github/workflows/install-smoke.yml
@@ -25,6 +25,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   smoke:
     name: Install-to-use smoke
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8c109cb..88eb5d4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,6 +9,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   test:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/wire-shape-contract.yml b/.github/workflows/wire-shape-contract.yml
index 372159f..dcbb12d 100644
--- a/.github/workflows/wire-shape-contract.yml
+++ b/.github/workflows/wire-shape-contract.yml
@@ -30,6 +30,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   wire-shape:
     name: Validate Wire Shape