docs: add Zenodo DOI badge

[nh13]

snakesee is now archived on Zenodo via the GitHub integration.

This adds a DOI badge using 10.5281/zenodo.21446438, the concept DOI covering all versions, which always resolves to the latest release.

Verified: currently resolves to 0.9.0.

Note: the archive covers the five most recent releases (0.6.2 through 0.9.0). Earlier releases and the snakesee-logger sub-crate tags were intentionally not archived.

Summary by CodeRabbit

• Documentation
  • Added a Zenodo DOI badge to the project README.
  • Added links supporting the badge display.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 31e62599-cdc4-4f7c-9f75-9f55d78b46b3

📥 Commits

Reviewing files that changed from the base of the PR and between 00f5d9c and f86f5cc.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README now includes a Zenodo DOI badge and defines the badge and link references required to render it.

Changes

README DOI badge

Layer / File(s)	Summary
Add DOI badge references README.md	Adds the DOI badge to the badge list and defines its Zenodo badge and link references.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A bunny spots a badge so bright,
With DOI stars that shine just right.
It hops through README’s leafy page,
And links the work from cage to stage.
“Zenodo!” it cheers, then wiggles its nose.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change: adding a Zenodo DOI badge.
Description check	✅ Passed	The description explains the change and testing context, and the missing template sections are non-critical.
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.

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[nh13]

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