[maintainer] Ingest validator take/commission into the neurons tier + expose in the directory

[JSONbored]

The validator directory's take/commission column cannot be built from current data: the neurons D1 table (NEURON_COLUMNS / NEURON_INSERT_COLUMNS, migration 0007) has no take/commission field, and the refresh-metagraph cron does not fetch it. This needs a schema migration, an ingestion change in the metagraph refresh path, and serving-side plumbing — infra + DB migration, not a self-contained bounty.

Deliverables

• Add a contiguous migrations/NNNN_*.sql adding a take/commission column to neurons (+ neuron_daily if history is wanted)
• Extend the metagraph refresh cron / staging loader to populate take from the upstream (Taostats) source and NEURON_INSERT_COLUMNS + normalizeNeuron
• Add take to NEURON_COLUMNS reads, formatNeuron, and buildGlobalValidatorEntry; expose in /api/v1/validators + contracts + OpenAPI
• Add the take/commission column to validators.index.tsx once the field ships
• Backfill/serving tests; guard nullish take from partial upstream snapshots

References

• repo/src/metagraph-neurons.mjs:7 (NEURON_COLUMNS - no take)
• repo/src/metagraph-neurons.mjs:15 (NEURON_INSERT_COLUMNS - no take)
• repo/workers/request-handlers/staging.mjs (metagraph staging/load path)
• repo/src/metagraph-neurons.mjs:80 (formatNeuron)

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size: M · maintainer-only (owner)

[linear-code]

JSO-2086