Add AIVariant tumor-normal caller with chromosome chunking

[iamh2o]

Summary

• add AIVariant SNV caller rules to process tumor-normal pairs
• configure AIVariant parameters in local and slurm profiles
• track tumor-normal pairs in rule_common and expose chromosome chunks
• use tum_nrm_sampleid_match column for pairing instead of external_sample_id
• update sample manifests, schema, and manifest generation scripts for the new column

Testing

• snakemake --lint (fails: command not found)
• pytest

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https://chatgpt.com/codex/tasks/task_e_68a2db7ec2f083319644519f7e8c8e42