[dgesteves]

Brings ROADMAP.md up to date with what has shipped.

• Next: the "Bring your own diff renderer" item is done (docs(own-renderer): review with useDiffReview while @pierre/diffs draws the diff, and a diff viewers table #241), so it leaves the list.
• Released: 0.12.0, 0.12.1, 0.13.0 and 0.14.0, each with its pull requests, from the changelog.
• Docs, examples and CI: the own-renderer guide and the diff viewers table (docs(own-renderer): review with useDiffReview while @pierre/diffs draws the diff, and a diff viewers table #241), registry items at their published ranges (fix(registry): ask for each dependency at its published range, name the version, typecheck every item in a new app #235), the API index (docs: an API index of every export, and contributor docs that match the repository #222) and the CopilotKit 1.82.0 example (chore(deps): move examples/copilotkit to CopilotKit 1.82.0, with one @ag-ui/client #224).

Closes #177