ci: use poe tasks for model generation in CI workflow

Add `generate-models-from-file` poe task that accepts a local file path,
working around datamodel-codegen's behavior where `url` in pyproject.toml
takes precedence over the `--input` CLI flag.

Update the CI workflow to call poe tasks instead of datamodel-codegen
directly, ensuring the downloaded artifact is actually used when available.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vdusek

.github/workflows/manual_regenerate_models.yaml

@@ -79,9 +79,9 @@ jobs:
       - name: Generate models from OpenAPI spec
         run: |
           if [[ -f openapi-spec/openapi.json ]]; then
-            uv run datamodel-codegen --input openapi-spec/openapi.json
+            uv run poe generate-models-from-file openapi-spec/openapi.json
           else
-            uv run datamodel-codegen
+            uv run poe generate-models
           fi
 
       - name: Commit model changes

pyproject.toml

@@ -269,4 +269,16 @@ shell = "./build_api_reference.sh && corepack enable && yarn && uv run yarn star
 cwd = "website"
 
 [tool.poe.tasks.generate-models]
-shell = "uv run datamodel-codegen"
+shell = "uv run datamodel-codegen && python scripts/fix_generated_models.py"
+
+[tool.poe.tasks.generate-models-from-file]
+# The --input flag is ignored when url is set in pyproject.toml, so we temporarily
+# replace url with input, run the generator, and restore the original pyproject.toml.
+shell = """
+sed -i 's|^url = .*|input = "'"$input_file"'"|' pyproject.toml
+uv run datamodel-codegen && python scripts/fix_generated_models.py
+STATUS=$?
+git checkout pyproject.toml
+exit $STATUS
+"""
+args = [{ name = "input-file", positional = true, required = true }]