[DOCS] Updated March release notes, new April release notes

[Stephen Epps (stepps00)]

Pull Request

Fixes #349

This pull request:

• bumps the config release version to 2026-04-15.0
• Adds a note in the March release referencing the confidence score work that took place that month
• Adds a new April release notes page, which includes notes for each of the themes.

[github-actions]

🗺️ OMF Docs previews are live!

🆕 Auto-gen schema site (beta)	https://staging.overturemaps.org/docs/pr/350/index.html
🗂️ Auto-gen schema ref	dev@04f8969
🌍 Repo schema site	https://staging.overturemaps.org/docs/pr/350-no-autogen/index.html
🕐 Updated	Apr 16, 2026 13:59 UTC
📝 Commit	f6249f2

Auto-gen schema site is now available. This is an early preview of a future workflow where we will automatically generate and publish reference docs for the Overture Maps Format schema with every change to the schema repo.
The auto-gen schema site may contain incomplete or inaccurate information as we are still refining the generation process, so please compare against the repo schema site and refer to the linked commit for the most up-to-date source of truth.

Note

♻️ This preview updates automatically with each push to this PR.

[github-actions]

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JAVASCRIPT_ES	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
SQLFLUFF	Pass ✅

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[Brad Richardson (brad-richardson)]

🚀🚀

[github-actions]

Super-linter summary

Language	Validation result
JAVASCRIPT_ES	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
SQLFLUFF	Pass ✅

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