downstream rows: per-category skills + paper type families + WBM link

downstream rows: add per-category skills

downstream docs: user-ready sidecar + fallback_rate key + precompute note

downstream docs: user-ready sidecar + fallback_rate key + precompute note

Add precomputed downstream leaderboard rows

downstream sidecar: rename overall_fallback_rate -> fallback_rate (xgboost)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (wbm)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (toto)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (multirocket)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (lsm2)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (linear)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (gru_d)

downstream sidecar: rename overall_fallback_rate -> fallback_rate (chronos2)

Add/update downstream metadata: linear

Add/update downstream substrate: linear

docs(downstream): refine SCHEMA.md

docs(downstream): refine README.md

docs(downstream): add top-level README.md

docs(downstream): add top-level SCHEMA.md

downstream bootstrap: add baseline field (downstream/bootstrap/SCHEMA.md)

downstream bootstrap: add baseline field (downstream/bootstrap/draws.meta.json)

Add/update downstream bootstrap reference: SCHEMA.md

Add/update downstream bootstrap reference: README.md

Add/update downstream bootstrap reference: draws.meta.json

Add/update downstream bootstrap reference: draws.parquet

Add/update downstream metadata: chronos2

Add/update downstream substrate: chronos2

Add/update downstream metadata: toto

Add/update downstream substrate: toto

Add/update downstream metadata: wbm

Add/update downstream substrate: wbm

Add/update downstream metadata: gru_d

Add/update downstream substrate: gru_d

Add/update downstream metadata: lsm2

Add/update downstream substrate: lsm2

Add/update downstream metadata: xgboost

Add/update downstream substrate: xgboost

Add/update downstream metadata: multirocket

Add/update downstream substrate: multirocket