maude: Phase 5 system modules + rewrite rules (21 tests, 159 total)

lib/maude/rewrite.sx: rl/crl transitions interleaved with eq normalisation.
mau/rewrite = default strategy (top-down, leftmost-outermost, first rule);
mau/rew bounded; mau/search = BFS reachability over all successors.

lib/maude/fire.sx: short-circuiting matcher (mau/fire-eq) — finds the first
productive match instead of enumerating the whole solution set. Fixes the
exponential blowup of AC rewriting on many identical elements (8 coins:
60s+ to <1s). Eager match-multiset kept only for match-all / search.

Verified on AC coin-change, traffic light, branching search, crl clock.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/maude/conformance.conf

@@ -11,6 +11,8 @@ PRELOADS=(
   lib/maude/reduce.sx
   lib/maude/matching.sx
   lib/maude/conditional.sx
+  lib/maude/fire.sx
+  lib/maude/rewrite.sx
 )
 
 SUITES=(
@@ -18,4 +20,5 @@ SUITES=(
   "reduce:lib/maude/tests/reduce.sx:(mau-reduce-tests-run!)"
   "matching:lib/maude/tests/matching.sx:(mau-matching-tests-run!)"
   "conditional:lib/maude/tests/conditional.sx:(mau-conditional-tests-run!)"
+  "rewrite:lib/maude/tests/rewrite.sx:(mau-rewrite-tests-run!)"
 )