diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 30d9cb0..d6c5e4e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,7 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
     branches: [main, master, develop]
+  merge_group:
   workflow_dispatch:
 
 permissions:
diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
index 2c5b801..5abc0eb 100644
--- a/.github/workflows/pr-validation.yml
+++ b/.github/workflows/pr-validation.yml
@@ -8,17 +8,28 @@ on:
     branches:
       - main
       - master
+  merge_group:
 
 permissions: {}
 
 concurrency:
-  group: pr-validation-${{ github.event.pull_request.number }}
+  # #ASSUME github.event.pull_request.number is null under merge_group;
+  # fall back to github.ref (unique per merge-group ref) so a merge-group
+  # build never collides with, or is cancelled by, a PR build's group.
+  # #VERIFY confirm no cross-cancellation between a PR run and its
+  # corresponding merge-group run after the first live merge-queue pass.
+  group: pr-validation-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
 jobs:
   title-check:
     name: PR Title Format
     runs-on: ubuntu-latest
+    # #CRITICAL github.event.pull_request.title is null under merge_group,
+    # so this check has nothing to validate there; restrict to pull_request.
+    # #VERIFY validate-dependencies below still reports success when this
+    # job is skipped under merge_group.
+    if: github.event_name == 'pull_request'
     permissions:
       pull-requests: read
     steps:
@@ -45,6 +56,11 @@ jobs:
   body-check:
     name: PR Body Non-Empty
     runs-on: ubuntu-latest
+    # #CRITICAL github.event.pull_request.body is null under merge_group,
+    # so this check has nothing to validate there; restrict to pull_request.
+    # #VERIFY validate-dependencies below still reports success when this
+    # job is skipped under merge_group.
+    if: github.event_name == 'pull_request'
     permissions:
       pull-requests: read
     steps:
@@ -82,18 +98,27 @@ jobs:
           TITLE_RESULT: ${{ needs.title-check.result }}
           BODY_RESULT: ${{ needs.body-check.result }}
         run: |
-          echo "## PR Validation Summary" >> $GITHUB_STEP_SUMMARY
-          echo "" >> $GITHUB_STEP_SUMMARY
-          echo "| Check | Result |" >> $GITHUB_STEP_SUMMARY
-          echo "|---|---|" >> $GITHUB_STEP_SUMMARY
-          echo "| PR Title Format | $TITLE_RESULT |" >> $GITHUB_STEP_SUMMARY
-          echo "| PR Body Non-Empty | $BODY_RESULT |" >> $GITHUB_STEP_SUMMARY
-          if [ "$TITLE_RESULT" != "success" ] || [ "$BODY_RESULT" != "success" ]; then
+          echo "## PR Validation Summary" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          echo "| Check | Result |" >> "$GITHUB_STEP_SUMMARY"
+          echo "|---|---|" >> "$GITHUB_STEP_SUMMARY"
+          echo "| PR Title Format | $TITLE_RESULT |" >> "$GITHUB_STEP_SUMMARY"
+          echo "| PR Body Non-Empty | $BODY_RESULT |" >> "$GITHUB_STEP_SUMMARY"
+          # #CRITICAL a required status check for the merge queue; a
+          # merge_group build skips title-check/body-check by design
+          # (no PR title/body to read there), so "skipped" is accepted
+          # here on top of "success". A real "failure" still fails this
+          # gate under either event, so the gate is not weakened, only
+          # made compatible with the merge_group event.
+          # #VERIFY watch the first live merge-group run to confirm this
+          # context reports success instead of stalling the queue.
+          ok() { [ "$1" = "success" ] || [ "$1" = "skipped" ]; }
+          if ! ok "$TITLE_RESULT" || ! ok "$BODY_RESULT"; then
             echo "::error::One or more PR validation checks failed."
             exit 1
           fi
-          echo "" >> $GITHUB_STEP_SUMMARY
-          echo "All PR validation checks passed." >> $GITHUB_STEP_SUMMARY
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          echo "All PR validation checks passed." >> "$GITHUB_STEP_SUMMARY"
 
   validate-dependencies:
     # Aggregator named to satisfy the org ruleset
@@ -115,19 +140,33 @@ jobs:
           TITLE_RESULT: ${{ needs.title-check.result }}
           BODY_RESULT: ${{ needs.body-check.result }}
         run: |
-          echo "## Dependency & Standards Validation" >> $GITHUB_STEP_SUMMARY
-          echo "" >> $GITHUB_STEP_SUMMARY
-          if [ "$TITLE_RESULT" = "success" ]; then
-            echo "Conventional Commits standard: Passed" >> $GITHUB_STEP_SUMMARY
+          echo "## Dependency & Standards Validation" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          # #CRITICAL required status check for the merge queue; a
+          # merge_group build skips title-check/body-check by design
+          # (no PR title/body to read there), so "skipped" is accepted
+          # here on top of "success" for each upstream job individually.
+          # A real "failure" still fails this gate under either event, so
+          # the gate is not weakened, only made compatible with the
+          # merge_group event. This aggregator currently only wraps
+          # title-check/body-check (no separate dependency-scan job feeds
+          # it on main); if a real scan job is added to this aggregator
+          # later, apply the same per-job success-or-skipped rule to it,
+          # never a blanket event-name bypass.
+          # #VERIFY watch the first live merge-group run to confirm this
+          # context reports success instead of stalling the queue.
+          ok() { [ "$1" = "success" ] || [ "$1" = "skipped" ]; }
+          if ok "$TITLE_RESULT"; then
+            echo "Conventional Commits standard: Passed" >> "$GITHUB_STEP_SUMMARY"
           else
-            echo "Conventional Commits standard: $TITLE_RESULT" >> $GITHUB_STEP_SUMMARY
+            echo "Conventional Commits standard: $TITLE_RESULT" >> "$GITHUB_STEP_SUMMARY"
           fi
-          if [ "$BODY_RESULT" = "success" ]; then
-            echo "PR Body standard: Passed" >> $GITHUB_STEP_SUMMARY
+          if ok "$BODY_RESULT"; then
+            echo "PR Body standard: Passed" >> "$GITHUB_STEP_SUMMARY"
           else
-            echo "PR Body standard: $BODY_RESULT" >> $GITHUB_STEP_SUMMARY
+            echo "PR Body standard: $BODY_RESULT" >> "$GITHUB_STEP_SUMMARY"
           fi
-          if [ "$TITLE_RESULT" != "success" ] || [ "$BODY_RESULT" != "success" ]; then
+          if ! ok "$TITLE_RESULT" || ! ok "$BODY_RESULT"; then
             echo "::error::Dependency and standards validation failed."
             exit 1
           fi
diff --git a/.github/workflows/reuse.yml b/.github/workflows/reuse.yml
index 849a86b..e9d3bee 100644
--- a/.github/workflows/reuse.yml
+++ b/.github/workflows/reuse.yml
@@ -12,6 +12,7 @@ on:
       - "REUSE.toml"
       - "LICENSES/**"
       - ".github/workflows/reuse.yml"
+  merge_group:
   push:
     branches:
       - main
diff --git a/.github/workflows/security-analysis.yml b/.github/workflows/security-analysis.yml
index 91e5ca3..3c7e017 100644
--- a/.github/workflows/security-analysis.yml
+++ b/.github/workflows/security-analysis.yml
@@ -7,6 +7,7 @@ on:
     branches: [main, master]
   pull_request:
     branches: [main, master]
+  merge_group:
   schedule:
     # Weekly scan on Mondays at 09:00 UTC
     - cron: '0 9 * * 1'