Merge the color mixing subsystem into the IMEX work

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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>

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Clifford GarwoodandClaude Opus 5 committed 2026-08-26 09:25:41 -04:00

2 parents 008d13a59e ba07716ddb

commit b24733cea8

171 files changed

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