Release v1.0.1

Bump version to 1.0.1 to verify Trusted Publishing end-to-end

No functional change - this is a live test of the new OIDC-based
publish workflow (the only way to exercise the actual npm publish
step, since it's gated on the version differing from what's live).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>