Pigsty v4.0 Released: Ready for the Agent Era

Pigsty v4.0, a batteries-included PostgreSQL distribution, is now available with a major infrastructure overhaul, PostgreSQL 18 readiness, and a return to the permissive Apache 2.0 license. This release brings 320 commits with significant improvements to observability, security, high availability, and Docker container support. See the v4.0 release blog for details.
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