fix(py/samples/model-garden): fix dependencies

[yesudeep]

zsh❯ py/bin/run_sample
Indexed 0 traces in 0ms in /Users/yesudeep/code/github.com/firebase/genkit/py/samples/model-garden/.genkit/traces_idx
Telemetry API running on http://localhost:4033
Project root: /Users/yesudeep/code/github.com/firebase/genkit/py/samples/model-garden
Genkit Developer UI: http://localhost:4000
Using CPython 3.12.8
Creating virtual environment at: /Users/yesudeep/code/github.com/firebase/genkit/py/.venv
Installed 38 packages in 50ms
2026-01-07 18:25:17 [debug    ] Creating a new global tracer provider for telemetry.
2026-01-07 18:25:17 [debug    ] local_telemetry_server exporter added succesfully.
Traceback (most recent call last):
  File "/Users/yesudeep/code/github.com/firebase/genkit/py/samples/model-garden/src/main.py", line 20, in <module>
    from genkit.plugins.vertex_ai.model_garden import VertexAIModelGarden, model_garden_name
ModuleNotFoundError: No module named 'genkit.plugins.vertex_ai'
/Users/yesudeep/.local/share/pnpm/global/5/.pnpm/@genkit-ai+tools-common@1.27.0_@types+node@22.13.5/node_modules/@genkit-ai/tools-common/lib/cjs/src/manager/process-manager.js:54
                    reject(new Error(`app process exited with code ${code}`));
                           ^

Error: app process exited with code 1
    at ChildProcess.<anonymous> (/Users/yesudeep/.local/share/pnpm/global/5/.pnpm/@genkit-ai+tools-common@1.27.0_@types+node@22.13.5/node_modules/@genkit-ai/tools-common/lib/cjs/src/manager/process-manager.js:54:28)
    at ChildProcess.emit (node:events:507:28)
    at ChildProcess._handle.onexit (node:internal/child_process:294:12)

Node.js v23.11.1

[gemini-code-assist]

Summary of Changes

Hello @yesudeep, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses and resolves dependency issues within the Python project structure. It specifically ensures that the Vertex AI plugin and the Model Garden sample have their required genkit related dependencies correctly declared in their respective pyproject.toml files and subsequently locked in uv.lock. This fix prevents potential runtime errors or build failures stemming from missing packages.

Highlights

• Vertex AI Plugin Dependencies: The py/plugins/vertex-ai/pyproject.toml file has been updated to include genkit-plugin-compat-oai as a new dependency, ensuring proper functionality for the Vertex AI plugin.
• Model Garden Sample Dependencies: The py/samples/model-garden/pyproject.toml file now correctly lists genkit-plugin-vertex-ai as a dependency, resolving dependency issues for the Model Garden sample.
• Dependency Lock File Update: The py/uv.lock file has been regenerated to reflect the addition of genkit-plugin-compat-oai for the Vertex AI plugin and genkit-plugin-vertex-ai for the Model Garden sample, ensuring consistent and reproducible builds.

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[gemini-code-assist]

Code Review

This pull request correctly updates dependencies for the model-garden sample and the vertex-ai plugin. The changes are necessary to ensure the sample works as expected. I have one suggestion to improve maintainability by sorting the dependencies alphabetically.