v1.0.0

Production release with upstream NTP synchronization, integration tests, and completed CLI commands.

Added

• Upstream NTP synchronization: background sync against configured upstream servers with clock offset tracking, stratum derivation, and corrected response timestamps.
• Network utilities: shared IPv4 CIDR matching used by ACL enforcement and tests.
• UDP integration test: live local server round-trip over UDP.
• Upstream sync tests: offline manager tests by default; live pool.ntp.org checks with SIMPLE_NTPD_NETWORK_TESTS=1.
• CLI: status, stats, and connections commands; test validates configuration.

Changed

• Production release version bumped to v1.0.0.
• Health checks and Prometheus metrics include upstream sync state.
• getStats() and getActiveConnectionCount() implemented on NtpServer.

Full Changelog: v0.3.4...v1.0.0