diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..5b31360
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,60 @@
+name: ci
+
+# Self-CI for this org `.github` repo.
+#
+# The org ruleset "main branch protection" requires the `ci / ci` status check on
+# every repo. Consumer repos satisfy it via a short caller workflow that invokes
+# the reusable workflows here. This repo only HOUSES those reusable workflows
+# (all `workflow_call`-only), so nothing emitted `ci / ci` and every PR sat
+# permanently "Expected — Waiting for status to be reported" and could not merge.
+#
+# This workflow produces that check by linting the workflow files with actionlint
+# — genuinely useful CI for a repo whose whole product is GitHub Actions YAML.
+#
+# Naming is load-bearing: the ruleset matches the required status check against
+# the JOB's check-run name, NOT "workflow / job". For a normal (non-reusable) job
+# the check-run name IS the job name, so the job must be named literally "ci / ci"
+# to emit that exact context. (A job named "ci" emits the context "ci" — which the
+# PR UI cosmetically *displays* as "ci / ci" but does NOT satisfy the requirement.)
+# This mirrors the org's aggregator-job convention.
+#
+# actionlint is pinned to a tagged release and installed by downloading the
+# release tarball and verifying its SHA256 — not `curl | bash` — to keep the
+# supply-chain surface auditable. Bump ACTIONLINT_VERSION + ACTIONLINT_SHA256
+# together (checksum from the release's *_checksums.txt).
+#
+# actionlint's shellcheck integration is disabled (`-shellcheck=`) for now: it
+# reports 4 pre-existing findings in the deploy/CI run-steps (SC2044 find-in-for
+# loops, SC2046/SC2086 quoting, one of which is intentional word-splitting in the
+# SAM deploy step). Those deserve a separate, tested cleanup rather than being
+# bundled into the gate that unblocks the repo. Re-enable shellcheck once fixed.
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  ci:
+    name: ci / ci
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install actionlint
+        env:
+          ACTIONLINT_VERSION: 1.7.12
+          ACTIONLINT_SHA256: 8aca8db96f1b94770f1b0d72b6dddcb1ebb8123cb3712530b08cc387b349a3d8
+        run: |
+          curl -fsSL -o actionlint.tar.gz \
+            "https://github.com/rhysd/actionlint/releases/download/v${ACTIONLINT_VERSION}/actionlint_${ACTIONLINT_VERSION}_linux_amd64.tar.gz"
+          echo "${ACTIONLINT_SHA256}  actionlint.tar.gz" | sha256sum -c -
+          tar -xzf actionlint.tar.gz actionlint
+        shell: bash
+
+      - name: Lint workflows
+        run: ./actionlint -color -shellcheck=
+        shell: bash
diff --git a/.github/workflows/labeler.yaml b/.github/workflows/labeler.yaml
new file mode 100644
index 0000000..6f3a8c0
--- /dev/null
+++ b/.github/workflows/labeler.yaml
@@ -0,0 +1,25 @@
+name: labeler
+
+# Thin caller that runs the org-wide reusable PR labeler (callable-labeler.yaml)
+# on THIS repo's own pull requests. The .github repo is the single source of truth
+# for the reusable workflows, but — like any consumer repo — it must invoke them
+# via a caller to use them on itself; without this, the labeler never runs on
+# .github's own PRs (the reusable is `workflow_call`-only).
+#
+# Permissions are load-bearing: callers MUST grant all three below. Reusable-
+# workflow permissions can only be downgraded from the caller, so omitting one
+# (e.g. issues:write) either fails to create labels or triggers a silent
+# startup_failure. `pull_request` (NOT pull_request_target) is correct here — the
+# org takes no fork PRs, so the lower-privilege event is sufficient.
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  label:
+    uses: ./.github/workflows/callable-labeler.yaml