chore(weave): add scorer_* columns to feedback table (031)

[nikumar1206]

Description

Adds four typed columns to the `feedback` table:

• `scorer_tags` `Array(String)`
• `scorer_ratings` `Map(LowCardinality(String), Float64)`
• `scorer_reasons` `Map(String, String)`
• `scorer_confidences` `Map(String, Float64)`

Non-null with empty defaults so existing rows need no backfill. DDL only — no readers or writers touch the columns yet.

Testing

Applied locally with `make migrate_local`; up + down both verified.

[nikumar1206]

• feat(weave): query filters for scorer_* Array/Map columns #6918
• feat(weave): add wandb.agent_monitor feedback type #6909
• feat(weave): scorer_* typed columns on feedback #6908
• chore(weave): add scorer_* columns to feedback table (031) #6906 👈 (View in Graphite)
• master

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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