The partitioner was told to reference chain ids, but no rendered line
ever showed one — chainLine emitted bare 'premises → conclusion', so
the model re-typed whole rendered lines into submit_partition and every
call failed 'unknown chain ids' validation (owner live report,
2026-09-30 evening). The generator's YOUR TARGET block had the same
blindness.
- chainLine now leads with the chain's id: [arg_x] n_a, n_b → n_c;
a bare proposition repeats its own id ([n_y] n_y (no premises)) —
mechanically teaching that its chain id IS its proposition id.
- PARTITIONER_INSTRUCTIONS rewritten to chains-primary vocabulary
(was still 'follows-edges, bijective re-encoding' — pre-chains
framing) with the id-only doctrine and singular propositions
first-class.
- partitionSchema/problemSchema gained field descriptions: ids
VERBATIM, never re-type, never invent.
- Generator OUTPUT bullet + target-block header say the same.
Design ruling en route: partitioner stays an LLM partitioning chains
(deterministic partitioning and propositions-as-targets both
considered and declined by the owner).