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Clifford GarwoodandClaude Opus 4.7
4966d0fae8
Introduce ImexRole::Span as a 5th tile cycle state that declares "this tool is the multicolor partner of Primary on the same gantry." Encoded as the `S` role suffix in `imex_mode_active_tools` (e.g. `0:P,1:S,2:M,3:M`). Disambiguates paired-gantry mc-mirror from 4-independent-copies — both share the same active_tools shape sans the marker. Span drives: - Multicolor block rule: now requires Span on primary's gantry to allow multi-color slicing in a parallel mode. Replaces the prior "≥2 tools on primary's gantry" check; pre-existing 4-tool multicolor configs need T1 flipped to Span. - Ghost aggregation: one ghost per non-primary gantry when Span is present, using the column-paired representative. Aggregated-mirror drag tracks primary 1:1 in X (gantries don't share an X rail) with X-flip baked into mesh-local frame so geometry still reads as mirrored. - Zone aggregation: one full-X row strip per non-primary gantry instead of per-tool quadrants. - UI: 5th button in IMEXModesCtrl. Cycle Off→P→C→M→S→Off, only offered on multi-gantry printers and only on tiles sharing primary's gantry row. Single source of pairing truth: group_imex_active_tools_by_gantry in IMEXHelpers, consumed by ghost factory and zone calculator. Also fixes the carriage collision strip's X-boundary check, which lacked the row constraint its Y-boundary counterpart already had — paired-gantry mc-mirror was drawing a spurious right-edge strip from T3 sitting diagonally from primary. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>