Consume the dead-code gate from ops instead of vendoring it

.github/workflows/lint.yml

@@ -18,9 +18,9 @@ jobs:
 
       # Pinned deliberately: an unpinned ruff picks up new rules on release and
       # turns a green branch red without anything in this repo changing.
-      - run: pip install ruff==0.16.2 vulture==2.14
+      - run: pip install ruff==0.16.2 vulture==2.14 pre-commit==4.6.2
 
       - run: ruff check .
 
       - name: Dead code
-        run: tools/check-dead-code.sh
+        run: pre-commit run --all-files --show-diff-on-failure

.pre-commit-config.yaml

@@ -0,0 +1,11 @@
+# The dead-code gate lives in offworldlabs/ops and is pinned here. Do not
+# vendor it back into this repo. See 86cb4jfhz.
+#
+# The ruff-config hook is deliberately absent: this repo's shared ruff standard
+# lives in ruff.toml, and check-ruff-config.py currently reads pyproject.toml
+# only. Tracked as 86cb4jfzk; add the hook once that lands.
+repos:
+  - repo: https://github.com/offworldlabs/ops
+    rev: hooks-v1.0
+    hooks:
+      - id: dead-code