diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4078ee62..f3d4af51 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -132,12 +132,39 @@ jobs:
           fail_ci_if_error: false
 
   # ============================================================================
-  # Haskell Jobs (registry)
+  # Haskell Jobs (registry) — dormant-ready.
+  # The Haskell sub-project (registry/) is currently absent (its source was
+  # removed). `detect-haskell` gates the Haskell jobs on the presence of
+  # registry/hypatia.cabal so they SKIP cleanly while it is gone and
+  # re-activate automatically the moment it lands again. This realises the
+  # intent that was previously only described in a comment but never enforced,
+  # which left haskell-build and haskell-lint failing unconditionally.
   # ============================================================================
+  detect-haskell:
+    name: Detect Haskell tree
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    outputs:
+      present: ${{ steps.check.outputs.present }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - name: Check for registry/hypatia.cabal
+        id: check
+        run: |
+          if [ -f registry/hypatia.cabal ]; then
+            echo "present=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "present=false" >> "$GITHUB_OUTPUT"
+            echo "::notice::registry/hypatia.cabal absent — Haskell build/lint jobs skipped (dormant)."
+          fi
+
   haskell-build:
     name: Haskell Build & Test
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    needs: detect-haskell
+    if: needs.detect-haskell.outputs.present == 'true'
     # registry/ is the Haskell sub-project; gate this job on its presence so
     # PRs that don't touch (and don't ship) the Haskell tree don't fail here.
     # The job re-activates the moment `registry/hypatia.cabal` lands.
@@ -195,6 +222,8 @@ jobs:
     name: HLint
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    needs: detect-haskell
+    if: needs.detect-haskell.outputs.present == 'true'
     steps:
       - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
@@ -205,7 +234,7 @@ jobs:
           version: '3.8'
 
       - name: Run HLint
-        uses: haskell-actions/hlint-run@0b0024319753ba0c8b2fa21b7018ed252aed8181 # v2.4.9
+        uses: haskell-actions/hlint-run@eaca4cfbf4a69f4eb875df38b6bc3e1657020378 # v2.4.10
         with:
           path: registry/
           fail-on: warning