Bump the version, add the 1.4.2 changelog and update notes, describe the
private storage, the local-only management gate and the download host in
the README. Exclude .github/ from Registry packages and remove the outdated
example workflows, regional fixtures, images and scripts from the runtime
repository; the workflows and documents that tests need now live under
tests/fixtures. The Remote LLM node shows when key management is unavailable
or local-only instead of failing on a 403.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
