maude: owise (otherwise) equations (8 tests, 229 total)

Parser reads trailing eq attributes (eq L = R [owise] .) via mau/split-attrs.
mau/crewrite-top is two-pass: ordinary equations first, owise last — an owise
catch-all fires only when no ordinary equation applies, regardless of
declaration order. Verified a catch-all declared first still defers.

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

lib/maude/scoreboard.md

@@ -1,6 +1,6 @@
 # maude scoreboard
 
-**221 / 221 passing** (0 failure(s)).
+**229 / 229 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
@@ -8,6 +8,7 @@
 | reduce | 26 | 26 | ok |
 | matching | 28 | 28 | ok |
 | conditional | 19 | 19 | ok |
+| owise | 8 | 8 | ok |
 | rewrite | 21 | 21 | ok |
 | searchpath | 8 | 8 | ok |
 | strategy | 19 | 19 | ok |