[Copilot]

This updates keith-vscode release documentation so release prep is explicit and consistent across versioning, changelog, and user docs. It also adds a complete release runbook and clarifies milestone usage.

• Release runbook (keith-vscode/RELEASE.md)

  • Added a full release flow: pre-release updates, GitHub release creation, publish workflow trigger, and post-publish verification.
  • Documented that milestones are optional for this repository’s release automation.

• Release maintenance contract (keith-vscode/README.md)

  • Added a dedicated section requiring release-time updates to:
    • keith-vscode/package.json version
    • keith-vscode/CHANGELOG.md
    • keith-vscode/README.md for user-facing changes
  • Linked to RELEASE.md for the full procedure.

• Changelog update (keith-vscode/CHANGELOG.md)

  • Added Unreleased entries for the new release guide and README release-maintenance documentation.

## Release maintenance

Before every release, keep these files up to date:

- `package.json`: bump `version` to the new extension version.
- `CHANGELOG.md`: document all user-visible changes for the new version.
- `README.md`: update user-facing documentation whenever behavior, requirements, or workflow changed.

For the full release process, see [RELEASE.md](./RELEASE.md).

• Fixes Write release guide for keith-vscode #114