Bump bridged to 1.0.0 and add the release notes: the single-leader,
single-host scope is closed — gateway, lifecycle, two-way delivery,
pluggable peers, auth/authz/audit, supervision, CI. Cross-host
federation (CB-308) is the next major line.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013ZGgxLQ2VpwZhEYoru8rkf
