artdag/opt-reduce: encode a DAG cone -> opt-term, mau/creduce against the
optimisation module, decode the normal form back to build-entries and rebuild.
Result-preserving: a 5-node blur;blur;id;bright0 chain collapses to 2 nodes and an
over(I,I) dedup 3->2, both executing identically to the original; non-optimisable
DAGs round-trip their radius faithfully (unary 1+1+1 -> 3). Completes Phase 7's
bridge-back + equivalence boxes. maude-optimize 33/33, total 191/191.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
lib/artdag/optimize-rules.sx — the effect-pipeline optimisation passes (identity
elim, no-op/zero-radius elim, adjacent fusion, idempotent over dedup) as a maude
module. Radius algebra is _+_ [assoc comm id: 0] (NOT Peano successor rules, which
are non-confluent here); mau/confluent? certifies 0 non-joinable critical pairs, so
the optimised pipeline's normal form / content id is rewrite-order stable. Consumes
lib/maude/confluence.sx. maude-optimize 25/25, total 183/183.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
