Updated path github action runs on

Author: russell-stern

.github/workflows/breaking-changes.yml

@@ -27,9 +27,25 @@ jobs:
       - name: Install dependencies
         run: bun install --frozen-lockfile
 
+      # cre-sdk's buf.yaml points at ../../submodules/chainlink-protos/cre, which buf rejects when
+      # --against uses subdir=packages/cre-sdk (module path escapes the context). Run breaking on
+      # the chainlink-protos workspace instead, comparing HEAD to the submodule commit pinned on main.
       - name: Buf breaking (proto)
-        working-directory: packages/cre-sdk
-        run: bun x @bufbuild/buf breaking . --against '.git#branch=main,subdir=packages/cre-sdk' --error-format github-actions
+        run: |
+          set -euo pipefail
+          REPO="${{ github.workspace }}"
+          SUBMODULE="${REPO}/submodules/chainlink-protos"
+          BASE_COMMIT=$(git -C "$REPO" rev-parse origin/main:submodules/chainlink-protos)
+          BASE_DIR="${RUNNER_TEMP}/chainlink-protos-baseline"
+          if ! git -C "$SUBMODULE" cat-file -e "${BASE_COMMIT}^{commit}" 2>/dev/null; then
+            git -C "$SUBMODULE" fetch --no-tags origin "${BASE_COMMIT}"
+          fi
+          git -C "$SUBMODULE" worktree add "${BASE_DIR}" "${BASE_COMMIT}" --detach
+          cleanup() {
+            git -C "$SUBMODULE" worktree remove "${BASE_DIR}" --force || true
+          }
+          trap cleanup EXIT
+          (cd "$SUBMODULE" && bun x @bufbuild/buf breaking cre --against "${BASE_DIR}/cre" --error-format github-actions)
 
   ts-api-surface:
     runs-on: ubuntu-latest

README.md

@@ -273,7 +273,7 @@ If your change is intentional, update the relevant baseline before pushing:
 
 | Contract | What triggers the failure | How to update |
 |---|---|---|
-| Proto fields | Field deleted, renamed, renumbered, or type changed | No baseline file needed — `buf breaking` passes once protos are correct |
+| Proto fields | Field deleted, renamed, renumbered, or type changed | No baseline file needed — CI runs `buf breaking` on `submodules/chainlink-protos` (`cre` module) against the submodule commit pinned on `main` |
 | TypeScript public API | An exported type/interface was removed or changed | Run `bun run update-api-baseline` inside `packages/cre-sdk` and commit `api-baseline.d.ts` |
 | JS host binding names | A binding was added, removed, or renamed in `host-bindings.ts` | Run `bun test --update-snapshots` inside `packages/cre-sdk` and commit the updated `__snapshots__` file |
 | Rust host imports | An `extern "C"` import was added or removed in `lib.rs` | Re-run the sed extraction (see `breaking-changes.yml`) and commit `host-imports-baseline.txt` |