📝 Add docstrings to phoenixtrajectory

[coderabbitai]

Docstrings generation was requested by @visahak.

• Add Phoenix trajectory extraction and sync functionality #18 (comment)

The following files were modified:

• extract_trajectories.py
• kaizen/frontend/cli/cli.py
• kaizen/sync/phoenix_sync.py

These file types are not supported

• README_extract_trajectories.md
• README_phoenix_sync.md

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