chore: bump version to v2026.4.111}
- Bump version from v2026.4.109 to v2026.4.111 in package.json
- Update version references in README.md header and footer
- Remove duplicate "P3X Network MCP" heading from README.md
- Add v2026.4.111 changelog entry for README documentation cleanup
- Update build version in change-log.md footer