1.1.78: Orca 2.5 dual-nozzle compatibility

Fixed

• Accept OrcaSlicer 2.5.0 dual-nozzle slices whose nozzle_volume_type contains one shared value. Resolve it only when the selected plate explicitly declares both physical extruder ids, types and matching nozzle variants; missing or conflicting selections still fail. This fixes the “unknown or malformed nozzle flow metadata” rejection reproduced with the official macOS build on H2C and X2D. The original output files pass inspection after the fix, with nozzle mapping and independent heater/material limits preserved. No physical print was run.

Validation and credit

• Full Node 24 suite: 1,148 passed, four optional/platform skips. Required behavior suite: 134 passed, one optional FULU-host skip. File inspection: 88 passed. Site build and clean packed startup passed.
• Real isolated official macOS Orca 2.5.0 slices checked for P1S 0.4 (single/two-colour), P1S 0.6, H2C, X2D and H2D 0.4. Original output bytes pass inspection. No physical print, Linux/Windows slicer execution, or dual-nozzle multi-material verification is claimed.
• Thanks to the OrcaSlicer contributors for publishing the source and executable used to reproduce and validate this compatibility fix.