docs: import Literal in the metadata-expansion example

[FBISiri]

The "expand the document metadata" example in the README uses Literal[...] for the topics field but only imports Annotated from typing. Copy-pasting the snippet as-is raises NameError: name Literal is not defined.

This one-line fix adds Literal to the import so the example runs as written. Docs-only — no logic change.

Reproduction (before fix):

>>> from typing import Annotated
>>> Annotated[list[Literal["A"]], ...]
NameError: name Literal is not defined

Summary by CodeRabbit

• Documentation
  • Updated the README example to include an additional Python import in the metadata expansion snippet, keeping the sample consistent with the documented type usage.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 20798d5b-f27e-46a4-88d9-34fb21970c59

📥 Commits

Reviewing files that changed from the base of the PR and between 6a540e1 and 435b13a.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README metadata example import now includes Literal alongside Annotated in the Python code sample.

Changes

README example update

Layer / File(s)	Summary
Import Literal in example README.md	The README code example import adds Literal to the existing Annotated import.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

\ /\
(•ㅅ•) I hopped through the README glow
/ 　 づ Literal joined the code’s soft flow
Metadata now chats in a tidy pair
A bunny nods: “Yay, types are there!” 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documentation-only change to import Literal in the metadata-expansion example.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[FBISiri]

Hey, just wanted to drop a quick note as Q2 closes out — wanted to make sure this didn't get lost in the queue.

This is a one-line docs fix: the Literal import was missing from the README metadata-expansion snippet, so copy-pasting it as-is gives a NameError. CodeRabbit has already reviewed and all pre-merge checks pass. Happy to address any feedback if you spot anything, but it should be ready to go as-is.

Let me know if there's anything blocking on your end!