Activates PDK for notebook notebooks/workflow_3_cascaded_mzi.ipynb

[jonbenfri]

Solves #673.

Summary by Sourcery

New Features:

• Enable gf.gpdk PDK activation in the cascaded Mach–Zehnder interferometer workflow notebook.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the cascaded MZI workflow notebook to explicitly activate the gf.gpdk PDK before use, ensuring the proper process design kit configuration is loaded for subsequent operations.

Sequence diagram for activating gf_gpdk_PDK_in_cascaded_MZI_notebook

sequenceDiagram
    actor User
    participant Notebook as workflow_3_cascaded_mzi
    participant gf as gdsfactory_gf
    participant gpdk as gf_gpdk
    participant PDK as gf_gpdk_PDK

    User->>Notebook: Run import and setup cell
    Notebook->>gf: import gdsfactory as gf
    Notebook->>gpdk: access gpdk attribute on gf
    Notebook->>PDK: gf.gpdk.PDK.activate()
    PDK-->>Notebook: Active PDK configuration set
    Notebook-->>User: Subsequent operations use activated PDK

Loading

File-Level Changes

Change	Details	Files
Explicitly activate the gf.gpdk PDK in the cascaded MZI workflow notebook initialization.	Extend the imports cell to include a call to gf.gpdk.PDK.activate() after importing PATH from gplugins.common.config Ensure PDK activation happens early in the notebook so all later cells use the correct PDK configuration	notebooks/workflow_3_cascaded_mzi.ipynb

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider moving gf.gpdk.PDK.activate() into a dedicated setup cell (e.g., clearly labeled as environment/PDK setup) so that PDK activation is isolated and easier to rerun or adjust without re-executing other imports or logic in the notebook.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider moving `gf.gpdk.PDK.activate()` into a dedicated setup cell (e.g., clearly labeled as environment/PDK setup) so that PDK activation is isolated and easier to rerun or adjust without re-executing other imports or logic in the notebook.

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