diff --git a/.github/workflows/ci1-title-probe.yml b/.github/workflows/ci1-title-probe.yml
new file mode 100644
index 00000000..573fbd90
--- /dev/null
+++ b/.github/workflows/ci1-title-probe.yml
@@ -0,0 +1,35 @@
+# The squash-merge commit takes the PR title, and the release planner reads that
+# commit to pick the next version. Validate the title as a Conventional Commit.
+name: PR Title probe
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions:
+  pull-requests: read
+
+jobs:
+  validate:
+    name: Validate PR title
+    runs-on: ubuntu-latest
+    steps:
+      - name: Record probe event
+        env:
+          EVENT_ACTION: ${{ github.event.action }}
+          EVENT_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          echo "action=$EVENT_ACTION head=$EVENT_SHA"
+          sleep 45
+      # Read the title from the API: a re-run reuses the original event payload.
+      # The planner ignores the "!" breaking marker, so the pattern rejects it.
+      - name: Lint PR title
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: |
+          title="$(gh pr view "$PR_URL" --json title --jq .title)"
+          types="feat|fix|perf|docs|style|refactor|test|build|ci|chore|revert|release"
+          if [[ ! "$title" =~ ^($types)(\([^()]+\))?:\ [^[:space:]] ]]; then
+            echo "::error::PR title \"$title\" is not a Conventional Commit: <type>(<scope>): <subject>, with type one of ${types//|/, }. Mark a breaking change with a BREAKING CHANGE: footer in the squash commit body, not with \"!\"."
+            exit 1
+          fi
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 8f566971..b7690d5b 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -1,20 +1,23 @@
 name: Dependency Review
 on:
   pull_request:
-    branches: [master]
+    branches: [master, ci/ci1-concurrency-probe-base]
 
 permissions:
   contents: read
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
-  cancel-in-progress: true
-
 jobs:
   dependency-review:
     name: Dependency Review
     runs-on: ubuntu-latest
     steps:
+      - name: Record probe event
+        env:
+          EVENT_ACTION: ${{ github.event.action }}
+          EVENT_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          echo "action=$EVENT_ACTION head=$EVENT_SHA"
+          sleep 45
       - name: Dependency Review
         uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
         with:
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 865e8394..2fe65068 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -9,15 +9,18 @@ on:
 permissions:
   contents: read
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
-  cancel-in-progress: true
-
 jobs:
   docs:
     name: Docs
     runs-on: ubuntu-latest
     steps:
+      - name: Record probe event
+        env:
+          EVENT_ACTION: ${{ github.event.action }}
+          EVENT_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          echo "action=$EVENT_ACTION head=$EVENT_SHA"
+          sleep 45
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
diff --git a/.github/workflows/pr-title.yml b/.github/workflows/pr-title.yml
index 155c3ade..0f964971 100644
--- a/.github/workflows/pr-title.yml
+++ b/.github/workflows/pr-title.yml
@@ -8,15 +8,18 @@ on:
 permissions:
   pull-requests: read
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
-  cancel-in-progress: true
-
 jobs:
   validate:
     name: Validate PR title
     runs-on: ubuntu-latest
     steps:
+      - name: Record probe event
+        env:
+          EVENT_ACTION: ${{ github.event.action }}
+          EVENT_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          echo "action=$EVENT_ACTION head=$EVENT_SHA"
+          sleep 45
       # Read the title from the API: a re-run reuses the original event payload.
       # The planner ignores the "!" breaking marker, so the pattern rejects it.
       - name: Lint PR title
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f0c8502d..46c17551 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,15 +9,18 @@ on:
 permissions:
   contents: read
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
-  cancel-in-progress: true
-
 jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
     steps:
+      - name: Record probe event
+        env:
+          EVENT_ACTION: ${{ github.event.action }}
+          EVENT_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          echo "action=$EVENT_ACTION head=$EVENT_SHA"
+          sleep 45
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with: