maude: witness-path search for puzzle solvers (8 tests, 221 total)

lib/maude/searchpath.sx — mau/search-path returns the shortest sequence of
states from start to goal (the solution moves), mau/search-length its step
count. BFS over all one-step successors, threading the path.

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

lib/maude/scoreboard.json

@@ -1,18 +1,19 @@
 {
   "lang": "maude",
-  "total_passed": 213,
+  "total_passed": 221,
   "total_failed": 0,
-  "total": 213,
+  "total": 221,
   "suites": [
     {"name":"parse","passed":65,"failed":0,"total":65},
     {"name":"reduce","passed":26,"failed":0,"total":26},
     {"name":"matching","passed":28,"failed":0,"total":28},
     {"name":"conditional","passed":19,"failed":0,"total":19},
     {"name":"rewrite","passed":21,"failed":0,"total":21},
+    {"name":"searchpath","passed":8,"failed":0,"total":8},
     {"name":"strategy","passed":19,"failed":0,"total":19},
     {"name":"meta","passed":18,"failed":0,"total":18},
     {"name":"pretty","passed":11,"failed":0,"total":11},
     {"name":"run","passed":6,"failed":0,"total":6}
   ],
-  "generated": "2026-06-07T15:33:57+00:00"
+  "generated": "2026-06-07T15:36:28+00:00"
 }