ci: auto-heal spec-sync PRs by regenerating the models

.github/workflows/sync-autoheal.yml

@@ -0,0 +1,74 @@
+name: Sync spec auto-heal
+
+# The automated spec-sync PRs (branch `chore/sync-v2-spec-*`) update
+# spec/openapi.yaml but not the generated comfy_low models, so the codegen-drift
+# check in ci.yml fails until someone runs scripts/gen_models.sh by hand. This
+# workflow does that automatically: on those branches it regenerates the models
+# and, if they changed, commits and pushes them back onto the PR branch.
+#
+# The push uses SPEC_SYNC_TOKEN (a token with contents:write) rather than the
+# default GITHUB_TOKEN: a GITHUB_TOKEN push does not re-trigger CI (GitHub's
+# recursive-run guard), so the required checks would stay red on the new head
+# commit. With SPEC_SYNC_TOKEN the follow-up CI run fires and goes green. When
+# regeneration produces no changes the step pushes nothing, so this cannot loop.
+#
+# Only runs on the sync branches; an ordinary PR is never touched.
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches: [main]
+
+concurrency:
+  group: sync-autoheal-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  autoheal:
+    if: startsWith(github.head_ref, 'chore/sync-v2-spec-')
+    runs-on: ubuntu-latest
+    env:
+      SPEC_SYNC_TOKEN: ${{ secrets.SPEC_SYNC_TOKEN }}
+    steps:
+      - name: Require a push-capable token
+        if: env.SPEC_SYNC_TOKEN == ''
+        run: |
+          echo "::error::SPEC_SYNC_TOKEN is not set — cannot push the regenerated" \
+               "models, so the codegen-drift check would stay red. Add a token with" \
+               "contents:write on this repo as the SPEC_SYNC_TOKEN secret." >&2
+          exit 1
+
+      - name: Check out the PR branch
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          token: ${{ env.SPEC_SYNC_TOKEN }}
+          ref: ${{ github.head_ref }}
+
+      - name: Set up Python
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+          cache-dependency-path: pyproject.toml
+
+      - name: Install codegen dependencies
+        run: pip install -e .[codegen]
+
+      - name: Regenerate the models from the vendored spec
+        run: bash scripts/gen_models.sh
+
+      - name: Commit and push the regenerated models if they changed
+        run: |
+          set -euo pipefail
+          if [ -z "$(git status --porcelain)" ]; then
+            echo "Generated models already in sync — nothing to push."
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add -A
+          git commit -m "chore: regenerate models for synced v2 spec"
+          git push origin "HEAD:${GITHUB_HEAD_REF}"