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Brings the upstream color-mixing feature and its follow-ups onto the branch so the IMEX placement and primary-routing checks are built and tested against them for the first time. Merged clean, no conflicts. Not yet exercised together: a mixed filament is a virtual slot no nozzle carries, while physical_extruder_map routes logical slots to physical heads, so the IMEX pem lookups have no defined answer for one. Print::extruders() lists mixed slots under their own id while tool_ordering.all_extruders() lists them post-expansion, and the IMEX code reads both. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>