fix: MambaLMHeadModel and create_block robustness - #1008
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Configs using ssm_cfg.layer=\"Mamba\" now map to Mamba1, and invalid layer names list all supported values.
Allow partial checkpoint loads for fine-tuned heads while keeping strict=True as the default for full pretrained restores.
Use temporary files plus os.replace so interrupted saves do not leave partial pytorch_model.bin or config.json behind.
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Summary
ssm_cfg.layer=\"Mamba\"alias for Mamba-1 blocks and list supported layer names on error.strict=infrom_pretrainedfor partial checkpoint loads.save_pretrainedartifacts atomically via temp files +os.replace.Test plan
create_block/from_pretrained/save_pretrainedpathsMade with Cursor