feat(tools): describe_var_column + var_columns in dataset schema#161
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Adds symmetric var-side metadata access for the chat agent. - ZarrAccess gets var_column(name) parallel to obs_column(name), wired through AnnDataStore, the api zarr_adapter, and the test fake - describe_var_column tool mirrors describe_obs_column: categorical -> top 50 values + counts; numeric -> min/max/mean/median/quartiles - get_dataset_schema payload includes var_columns so the agent can discover gene-metadata columns (gene_symbol, feature_id, etc.) up front instead of guessing Fixes the gene-symbol blind spot: previously the agent could see obs columns but had no way to learn which var column holds gene symbols.
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Summary
Adds symmetric var-side metadata access for the chat agent. Fixes the gene-symbol blind spot — previously the agent saw obs columns but had no way to discover which var column holds gene symbols.
A future cleanup is to combine `describe_obs_column` + `describe_var_column` into one `describe_column(axis, name)` tool; left as follow-up.
Test plan