Hyperscript: precedes/follows comparisons, tokenizer keywords

Parser: precedes/follows comparison operators in parse-cmp.
Tokenizer: precedes, follows, ignoring, case keywords.
Runtime: precedes?, follows? string comparison functions.

372/831 (45%)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/hyperscript/tokenizer.sx

@@ -166,7 +166,11 @@
     "select"
     "reset"
     "default"
-    "halt"))
+    "halt"
+    "precedes"
+    "follows"
+    "ignoring"
+    "case"))
 
 (define hs-keyword? (fn (word) (some (fn (k) (= k word)) hs-keywords)))