chore: bump version to v2026.4.327 and update changelog}
- Bump package version from v2026.4.326 to v2026.4.327 in package.json
- Update build version references from v2026.4.325 to v2026.4.326 across docs
- Remove duplicate v2026.4.323 changelog entry from change-log.md
- Update version in README.md, INSTALL.md, todo.md, change-break.md,
artifacts/php-7.2-ubuntu.md, and artifacts/screenshots.md