chore(release): bump version to v2026.4.644 and update changelog}
- Bump version from 2026.4.643 to 2026.4.644 in package.json - Add v2026.4.644 changelog entry with VectorSet support, RedisBloom probabilistic data structures, Angular esbuild migration, and multiple bugfixes - Update README with new RedisBloom and Redis 8 VectorSet documentation sections and Angular CLI esbuild migration note - Upgrade dependencies: axios ^1.15.0, corifeus-builder ^2026.4.139, electron ^41.2.0, p3x-redis-ui-material ^2026.4.420, MUI v7 to v9 - Extend .npmignore with comprehensive exclusion patterns for config files, build artifacts, agents, tests, and secure directory - Remove temporary .changelog-prompt.tmp file - Update footer version references across all documentation and changelog files from v2026.4.642 to v2026.4.644