Architectural pivot from per-axis grammar expansion (ADR-0122/0123/0123a/
0123b, all 0/1319 sealed lift) to candidate-graph topology with round-trip
admissibility filter. Converts compound-gap failure from multiplicative
p^k to parallel 1-(1-p)^k.
Adds new invariant: round-trip admissibility (op slots must reconstruct
to byte-equal source sentence under whitespace/case normalization).
Preserves wrong==0, trace_hash byte-equality, pack-binding, replay
determinism, no stochastic sampling.
Exit criterion: 50-case GSM8K train-split sample (unsealed) must show
correct >=10/50 with wrong==0 before any sealed-holdout run. If miss,
escalate to Path B (benchmark re-selection).
Supersedes ADR-0123b (never opened as PR).
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