Immersive Portals - CE 6.0.9

Added

• Seamless Sable 2.0.5 dimension-stack migration for moving sublevels, including global plot ownership across dimensions, rider/passenger preservation, live velocity, loading tickets, interpolation history, and remote entity tracking.
• Explicit server-first Sable rider handoff protocol with correlated acknowledgements so portal rotation, camera orientation, and gravity transforms remain authoritative across cross-dimension teleports.
• Automated dedicated-server plus real-client Sable end-to-end coverage over both UDP and TCP fallback, including Overworld -> Nether -> Overworld crossings, gravity-driven recrossing, rotated portals, rider dismount, and opposite-dimension movement observation.
• Automated portal visual regression coverage for clipping, shader/resource reloads, Sodium, Iris, Veil, and vanilla renderer configurations, plus nightly extended verification.
• Veil compatibility hook for portal shader recompilation and local Create Aeronautics/Simulated/Offroad development-runtime support.

Fixed

• Fixed Sable sublevels disappearing, flickering between dimensions, or becoming stuck at dimension-stack boundaries during migration.
• Fixed retained Sable riders skipping Immersive Portals' rotation/gravity camera transformation during server-first teleports.
• Fixed stale deferred Sable teleport state that could block later portal crossings after an aborted or reordered handoff.
• Fixed source and destination Sable client copies overlapping too long under UDP/slow-runner timing by recording destination pre-sync before queueing it and retiring the source copy immediately after migration commit.
• Fixed portal rendering corruption where geometry behind the active portal clipping plane could still render.
• Restored published NeoForge mod identities/entry points for immersive_portals_core, imm_ptl, and q_misc_util.
• Moved the mod icon to the correct packaged asset location while keeping NeoForge metadata pointed at the packaged root icon.

Changed

• Reworked Sable packet redirection and tracking so sublevel packets target the correct logical client world and duplicate destination full-syncs are suppressed during handoff.
• Made Sable migration transactional: destination state is prepared before source retirement, and player teleport is cancelled if the moving sublevel cannot commit safely.
• Replaced fragmented CI checks with a canonical verification harness covering core build/JUnit/GameTests, graphical Sable E2E, renderer visual checks, retained failure evidence, and one stable required-status gate.
• Hardened release automation so a successful main CI run after a version bump creates the version tag and dispatches the fully verified GitHub/CurseForge release workflow.

Sable remains optional. Normal Immersive Portals behavior is unchanged when Sable is absent.