Add changeset versioning workflow

[nathan2slime]

Summary

• add a dedicated GitHub Actions workflow to run changesets/action on master pushes and manual dispatch
• configure the workflow to create/update a release PR using pnpm run version-packages
• add a root CHANGELOG.md so the changesets action can read and update changelog output without failing

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Project	Deployment	Actions	Updated (UTC)
ui	Building	Preview, Comment	Mar 18, 2026 0:23am

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Listen for pushes on main instead of master

I checked the refs in this checkout and the long-lived branch here is main (refs/heads/main exists, while refs/heads/master does not). Because this workflow only subscribes to push events on master, normal merges into the branch maintainers are using will never run changesets/action, so the release PR will only move forward if someone remembers to trigger it manually.

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