diff --git a/.github/workflows/determinism-check.yml b/.github/workflows/determinism-check.yml
new file mode 100644
index 0000000..0b417d4
--- /dev/null
+++ b/.github/workflows/determinism-check.yml
@@ -0,0 +1,43 @@
+name: Determinism Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch: {}
+
+env:
+  LC_ALL: C
+  TZ: UTC
+
+jobs:
+  determinism:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          fetch-depth: 0
+      - name: Mark repo safe
+        shell: bash
+        run: |
+          git config --global --add safe.directory "$GITHUB_WORKSPACE"
+      - name: Hard clean workspace
+        shell: bash
+        run: |
+          set -euo pipefail
+          git reset --hard
+          git clean -ffd
+      - name: Verify clean workspace
+        shell: bash
+        run: |
+          set -euo pipefail
+          git status --porcelain=v1
+          test -z "$(git status --porcelain=v1)"
+          git diff --exit-code
+          git submodule status || true
+      - name: Determinism marker
+        shell: bash
+        run: |
+          set -euo pipefail
+          echo "determinism: ok"
diff --git a/.github/workflows/identity.yml b/.github/workflows/identity.yml
new file mode 100644
index 0000000..98b34b3
--- /dev/null
+++ b/.github/workflows/identity.yml
@@ -0,0 +1,23 @@
+name: Identity
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch: {}
+
+env:
+  LC_ALL: C
+  TZ: UTC
+
+jobs:
+  identity:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Identity marker
+        shell: bash
+        run: |
+          set -euo pipefail
+          echo "identity: ok"