Release Engine 0.183.322 with retry-safe network purge and artifact gate - #49

Scope

• Retry account purge for owned networks left in removing after an interrupted remove.
• Build CI in release mode and reject development JAR/default content in release artifacts.
• Bump Engine to 0.183.322 and update README, compatibility and release notes.

Evidence

• AccountPurgeNetworkTest: 3/3 PASS.
• Release-artifact gate fixtures: 6/6 PASS; clean release bundle gate PASS.
• JDK 25 Maven release-profile build: 89/89 modules PASS.
• QA runtime and full OIDC permission matrix remain gated on the immutable Server image assembled from this Engine release; no production deployment.