One file per release, plus `unreleased.md` for what has not shipped. `bun run changelog:build` renders `CHANGELOG.md` (app), `packages/vscode/CHANGELOG.md` (extension, shown by the Marketplace as is), and `index.json` (for the website). Edit the files here; the generated ones are overwritten.
Groups may appear in any order in a source file; the generator emits them as New, Improvements, Fixes, Misc and drops empty ones. A release without a `## VS Code` section is absent from the extension changelog. Every release needs a `title`; `unreleased.md` carries only the `title` line in its front matter and gets `version` and `date` at release time.
`bun run changelog:check` fails when the generated files are behind their sources; CI runs it. `oc-dev create-release` promotes `unreleased.md` to `<version>.md` with today's date and rebuilds.