chore: rf namespace and consolidation (FXC-3912, FXC-3965)

[daquinteroflex]

• from tidy3d.rf import *
• Backwards compatible changes

Greptile Overview

Greptile Summary

This PR introduces a new tidy3d.rf namespace to consolidate all RF-related classes from the microwave and smatrix plugins, making them accessible via from tidy3d.rf import *. The PR also adds backwards compatibility aliases for renamed path integral classes in both the top-level package and microwave plugin.

Key changes:

• Created new tidy3d/rf.py module that exports all RF classes from microwave and smatrix plugins
• Added backwards compatibility aliases in tidy3d/__init__.py for four renamed integral classes
• Added backwards compatibility aliases in tidy3d/plugins/microwave/__init__.py for all five renamed integral classes
• Updated CHANGELOG.md to document the new namespace and reorganize breaking changes into "Breaking Changes" and "Planned Deprecation" sections

Critical issue found: The new tidy3d.rf module is missing the CustomPathIntegral2D backwards compatibility alias that exists in the microwave plugin. This breaks backwards compatibility for users importing from the new RF namespace.

Confidence Score: 2/5

• This PR has a critical backwards compatibility issue that will cause runtime errors for users
• Score reflects a critical missing backwards compatibility alias (CustomPathIntegral2D) in the new RF namespace that exists in the microwave plugin, which will break user code that relies on the deprecated class name when importing from tidy3d.rf. Additionally, the warning message contains emojis which violates the codebase style guidelines.
• Pay close attention to tidy3d/rf.py which has critical missing backwards compatibility alias and style violation

Important Files Changed

File Analysis

Filename	Score	Overview
tidy3d/rf.py	2/5	New RF namespace module missing CustomPathIntegral2D backwards compatibility alias and contains emoji in warning message
tidy3d/init.py	5/5	Added backwards compatibility aliases for renamed integral classes, properly exported in __all__
tidy3d/plugins/microwave/init.py	5/5	Added all backwards compatibility aliases including CustomPathIntegral2D, properly exported in __all__
CHANGELOG.md	5/5	Added entry for new tidy3d.rf namespace and reorganized breaking changes into proper sections

Sequence Diagram

sequenceDiagram
    participant User
    participant tidy3d.rf
    participant tidy3d.__init__
    participant microwave_plugin
    participant components

    Note over User,components: New RF Namespace Consolidation

    User->>tidy3d.rf: from tidy3d.rf import *
    tidy3d.rf->>components: Import path integrals
    tidy3d.rf->>microwave_plugin: Import models, array_factor, rf_material_library
    tidy3d.rf->>microwave_plugin: Import smatrix components
    tidy3d.rf-->>User: Return consolidated RF classes
    
    Note over tidy3d.rf: Create backwards compatibility aliases:<br/>CurrentIntegralTypes, VoltageIntegralTypes,<br/>ComponentModeler, CustomPathIntegral2D (MISSING)

    User->>tidy3d.__init__: from tidy3d import VoltageIntegralAxisAligned
    tidy3d.__init__->>components: Import AxisAlignedVoltageIntegral
    Note over tidy3d.__init__: Create backwards compatibility alias:<br/>VoltageIntegralAxisAligned
    tidy3d.__init__-->>User: Return aliased class

    User->>microwave_plugin: from tidy3d.plugins.microwave import CustomPathIntegral2D
    microwave_plugin->>components: Import Custom2DPathIntegral
    Note over microwave_plugin: Create backwards compatibility alias:<br/>CustomPathIntegral2D
    microwave_plugin-->>User: Return aliased class

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[greptile-apps]

_{4 files reviewed, 3 comments}

_{Edit Code Review Agent Settings | Greptile}

[dmarek-flex]

Thanks for doing the dirty work!

[github-actions]

Diff Coverage

Diff: origin/develop...HEAD, staged and unstaged changes

• tidy3d/init.py (100%)
• tidy3d/plugins/microwave/init.py (100%)
• tidy3d/rf.py (100%)

Summary

• Total: 48 lines
• Missing: 0 lines
• Coverage: 100%

[dmarek-flex]

I think you have got most of the rf-specific stuff

[weiliangjin2021]

A few others:

• medium.py: LossyMetalMedium, SurfaceImpedanceFitterParam, HammerstadSurfaceRoughness, HuraySurfaceRoughness
• grid_spec.py: LayerRefinementSpec, CornerFinderSpec
• subpixel_spec.py: SurfaceImpedance