yoi/.yoi/tickets/00001KXRM6G0G/resolution.md

Implemented flat candidate staging record schema.

The memory extract staging path now treats staging as flat candidate records: one extract run can produce zero or more staging files, and each staging file is one consolidation decision unit. The transitional write_extracted path now accepts candidates[], and the host expands each candidate into a flat StagingRecord with schema version, ids, source, kind, claim, usefulness, optional staleness, bounded evidence, and source refs.

Validation passed:

• cargo fmt --check
• cargo test -p memory
• cargo test -p worker
• nix build .#yoi