docs: add attribution to original breadcrumbs repo

[mdroidian]

Summary

• add an Acknowledgements section to README
• credit Joel Chan with profile link
• link to the original roam-breadcrumbs-extension repo
• include prompt/testing credit note

Testing

• not run (docs-only change)

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.