search: Phase 2 query parser + 32 tests

Query tokenizer + recursive-descent parser: OR<AND<NOT precedence, implicit AND
on adjacency, quoted phrases, parens, case-insensitive keywords. parseQuery,
searchQuery, showQ. Worked around haskell-on-sx parser limits (ord-based
delimiters; multi-clause fns instead of []-pattern case alts). 78/78.

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

lib/search/scoreboard.json

@@ -1,11 +1,12 @@
 {
   "lang": "search",
-  "total_passed": 46,
+  "total_passed": 78,
   "total_failed": 0,
-  "total": 46,
+  "total": 78,
   "suites": [
     {"name":"index","passed":18,"failed":0,"total":18},
-    {"name":"boolean","passed":28,"failed":0,"total":28}
+    {"name":"boolean","passed":28,"failed":0,"total":28},
+    {"name":"parse","passed":32,"failed":0,"total":32}
   ],
-  "generated": "2026-06-06T18:46:54+00:00"
+  "generated": "2026-06-06T19:42:39+00:00"
 }