Query verified annual EIA-860 generator ownership.
Returns the Owner schedule's raw owner names and ownership shares for each
`eia_plant_id` + `generator_id`. `percent_owned` is the workbook's raw fraction of
one (0.6 = 60%), not a whole-number percent. Filter by plant, generator, exact raw
owner name, state, owner state, annual vintage, or source-reported balancing
authority code; `{"state":"TX","balancing_authority_code":"ERCO"}` returns an ERCOT
slice in one call. Owner-name matching is exact and intentionally performs no
normalization or entity resolution.
Critical EIA convention: the Owner schedule contains only jointly owned generators
and generators wholly owned by an entity other than the operator. A generator absent
from it is wholly owned by the operator in that same annual EIA-860 Generator
schedule. An exact plant+generator query exposes this as `ownership_resolution`;
it does not fabricate an Owner row or a 1.0 source share. Annual vintages remain
independently queryable. Every returned share cites its exact ZIP member, sheet, row,
and `Percent Owned` cell for SHA-256 verification.
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