Add a notebook optional dependency extra

[njzjz-bot]

Summary

• add dargs[notebook] with the IPython runtime dependency
• document the notebook installation command
• verify the extra is present in built wheel metadata

Fixes #128.

Validation

• Built wheel with --no-isolation
• Verified wheel METADATA provides the notebook extra and IPython requirement

AI attribution

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: bd499234-88b4-4d7b-8a4d-91430c4c20da

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[njzjz-bot]

Review result: no blocking issues found.

The dedicated notebook extra matches the module's runtime import of IPython and the README documents the correct installation command. I built the wheel and confirmed Provides-Extra: notebook plus the conditional IPython requirement in METADATA; CI is green.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh