[vrtmrz]

This documentation update records the published Commonlib 0.4.3 release and distinguishes its available package setting from the unreleased Self-hosted LiveSync dialogue changes.

• Update the README to identify 0.4.3 on npm latest and next, with its GitHub Release notes.
• Mark the plaintext acceptance setting as available in Commonlib 0.4.3 while retaining the setting contract and host release status.

Validation: compared the version, dist-tags, release URL, and tag commit with npm and GitHub; git diff --check passes. No runtime code or published package bytes change.