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5dcd026ef7
_validate_artifacts_for_stage looked up CANONICAL_STAGE_ARTIFACTS[stage] unconditionally, but the valid stage list comes from the pipeline manifest via get_pipeline_stages(), which declares stages beyond the 9 canonical ones — e.g. character-animation adds `character_design`/`rig_plan`. Such a stage passes the `stage in valid_stages` guard, then raised an unhandled KeyError on the canonical lookup, so those stages could never be checkpointed (the crash hits write/read_checkpoint and friends, even for in_progress checkpoints). Look the canonical artifact up defensively with `.get()` and skip the required-artifact check when there is none. Canonical stages still require their artifact when completed.