- recordWidthPlan narrows index-signature sources into declared-only targets (declared fields copy off their struct slots, the overflow drops with the width); absent-field completion declines there — the overflow could hold the key at runtime, and a completed undefined would drop the value Node keeps
- the overflow capture initializes same-named declared target fields directly off the source, admitting REQUIRED declared members; literal writes to names the target does not declare go overflowOnly, and a dispatch-writes gate keeps the validator's collision rule for the rest
- widthLiftPlan gains dynIn (a typed field into an 'unknown' slot — the static→DOM deep copy), upcast (derived into base, the prefix-layout reinterpret), and funcAdapt (funcCoerceAdapter's CLEAN subset — the stranded trap-only dispositions stay top-level, never inside a width plan)
- SC2002 now names the first blocking rule per record pair (describeRecordWidthBlocker mirrors the planners' gates) and its message/hint/registry entry speak the width-copy truth — the manifest flips the one entry name
- corpus 2556/2557 pin both hybrid directions and the new lifts byte-identical vs Node on both backends; diagnostics fixture record-width pins the residue's pointed messages
Chris Tate
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