Phase 2: consolidation — one registry, one backbone, real MM-DiT, one trainer#12

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revamp/phase-1-correctnessfrom

revamp/phase-2-consolidation

Commits on Jul 23, 2026

chore: delete dead code

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refactor: one model registry as the single source of truth for construction

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refactor(models): one shared DiT backbone and one modulated block

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feat(models): real dual-stream MM-DiT

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refactor(trainer): collapse the trainer hierarchy to one concrete trainer

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feat: legacy checkpoint conversion script for the new param layout

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