cast's first release: package.json has said 0.1.0 since the first commit,
so the ceremony's bump is a no-op and this PR is the stamp — the
Unreleased section becomes 0.1.0 with today's date. The tag will make it
true: release.yml builds the prebuilt cast-0.1.0.tgz asset and the
installer's default channel goes live. Drilled twice on 2026-07-19,
including the asset path end to end on a scratch fork.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
