fix(bidi): export BidiGeminiLiveModel and BidiOpenAIRealtimeModel

[cagataycali]

Description

Fixes missing exports in strands.experimental.bidi.models module that caused ImportError when users followed the official documentation examples.

Problem: Users following documentation at:

• Gemini Live docs
• OpenAI Realtime docs

Were encountering:

from strands.experimental.bidi.models import BidiOpenAIRealtimeModel
# ImportError: cannot import name 'BidiOpenAIRealtimeModel' from 'strands.experimental.bidi.models'

Solution:

• Added BidiGeminiLiveModel and BidiOpenAIRealtimeModel to imports
• Added both classes to __all__ list in src/strands/experimental/bidi/models/__init__.py

Why this matters: The classes exist and work perfectly when imported directly (from .openai_realtime import BidiOpenAIRealtimeModel), but were not exposed at the package level, causing confusion for users following the docs.

Related Issues

Discovered during testing of bidirectional streaming examples. No existing issue.

Documentation PR

No documentation changes needed - this PR aligns code with existing documentation.

Type of Change

Bug fix

Testing

How have you tested the change?

Manual Testing:

# Before: ImportError
# After: Works correctly
from strands.experimental.bidi.models import BidiOpenAIRealtimeModel
from strands.experimental.bidi.models import BidiGeminiLiveModel

# Both imports now work as documented

Verification:

• Tested that imports work from top-level strands.experimental.bidi.models

• Verified existing direct imports still work: from strands.experimental.bidi.models.openai_realtime import BidiOpenAIRealtimeModel

• Confirmed no breaking changes to existing code

• [x] I ran hatch run prepare

Checklist

• [x] I have read the CONTRIBUTING document
• [x] I have added any necessary tests that prove my fix is effective or my feature works
• [x] I have updated the documentation accordingly
• [x] I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests.

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[mkmeral]

Gemini and OpenAI requires lazy loading on imports, so closing in favor of https://github.com/strands-agents/sdk-python/pull/1383/files