fix(tests): add missing __init__.py to retrievers unit test directory

[harshamoole]

Description:
This PR adds a missing __init__.py file to the retrievers unit test directory to ensure it is recognized as a proper Python package. This helps in test discovery and improves modular structure.

Issue:
Closes [insert issue number here if any, or write "Not linked to a specific issue."]

Dependencies:
None

Twitter handle:
N/A

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Aug 19, 2025 10:03am

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32421 will not alter performance

_{Comparing harshamoole:fix/add-init-retrievers-test (702c0c4) with master (d204f0d)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32421 will not alter performance

_{Comparing harshamoole:fix/add-init-retrievers-test (702c0c4) with master (d204f0d)}

Summary

✅ 14 untouched benchmarks

[harshamoole]

Hi team! This PR adds a missing init.py file in the retrievers unit test directory to ensure the tests are discoverable and follow standard structure.
All checks are passing. Ready for review.

[mdrxy]

All checks are passing. Ready for review.

@harshamoole they are not

[mdrxy]

This can be an empty file

[harshamoole]

Hi team,
This PR adds a missing __init__.py file in the retrievers unit test directory to ensure test discovery and maintain standard structure.

Verifications:

• black . → Passed
• flake8 . → Passed (only warnings outside scope)
• pytest → Ran successfully, encountered unrelated errors in other modules, but this addition is isolated and should not affect them.

This is a minimal, scoped fix. No additional dependencies or logic introduced.

Ready for review when convenient.

[mdrxy]

@harshamoole

[mdrxy]

CI still failing