ci: fix tomllib ModuleNotFoundError on Python 3.10

Root cause: `tomllib` is stdlib only in Python 3.11+. The CI matrix
includes 3.10, so `import tomllib` blew up with ModuleNotFoundError
in the "Validate pyproject" step on the 3.10 leg.

Fix:
- ci.yml + publish.yml: try `tomllib`, fall back to `tomli`.
- publish.yml: add explicit `pip install tomli` step (publish runs on
  3.12 so tomllib usually works, but the fallback is now safe either way).

No code changes; CI/publish only.

Author: Code2Collapse

.github/workflows/ci.yml

@@ -45,7 +45,11 @@ jobs:
       - name: Validate pyproject.toml
         run: |
           python - <<'PY'
-          import tomllib, sys
+          try:
+              import tomllib
+          except ModuleNotFoundError:
+              import tomli as tomllib
+          import sys
           d = tomllib.load(open("pyproject.toml", "rb"))
           assert "project" in d, "missing [project]"
           p = d["project"]

.github/workflows/publish.yml

@@ -37,11 +37,17 @@ jobs:
           python-version: "3.12"
           cache: pip
 
+      - name: Install validation deps
+        run: pip install --upgrade pip tomli
+
       - name: Validate pyproject for Comfy
         shell: bash
         run: |
           python - <<'PY'
-          import tomllib
+          try:
+              import tomllib
+          except ModuleNotFoundError:
+              import tomli as tomllib
           d = tomllib.load(open("pyproject.toml", "rb"))
           p = d.get("project", {})
           assert p.get("name"), "[project].name required"