HS: contains/matches ignoring case support — 425→426

- Parser: contains/matches with ignoring case modifier
- Compiler: contains-ignore-case? → hs-contains-ignore-case?
- Compiler: matches-ignore-case? → hs-matches-ignore-case?
- Runtime: downcase-based case-insensitive contains/matches

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

lib/hyperscript/runtime.sx

@@ -392,6 +392,12 @@
   hs-eq-ignore-case
   (fn (a b) (= (downcase (str a)) (downcase (str b)))))
 ;; DOM query stub — sandbox returns empty list
+(define
+  hs-contains-ignore-case?
+  (fn
+    (haystack needle)
+    (contains? (downcase (str haystack)) (downcase (str needle)))))
+;; Method dispatch — obj.method(args)
 (define
   hs-falsy?
   (fn
@@ -403,7 +409,9 @@
       ((and (list? v) (= (len v) 0)) true)
       ((= v 0) true)
       (true false))))
-;; Method dispatch — obj.method(args)
+
+;; ── 0.9.90 features ─────────────────────────────────────────────
+;; beep! — debug logging, returns value unchanged
 (define
   hs-matches?
   (fn
@@ -412,9 +420,7 @@
       (string? target)
       (if (= pattern ".*") true (string-contains? target pattern))
       false)))
-
-;; ── 0.9.90 features ─────────────────────────────────────────────
-;; beep! — debug logging, returns value unchanged
+;; Property-based is — check obj.key truthiness
 (define
   hs-contains?
   (fn
@@ -434,9 +440,9 @@
               true
               (hs-contains? (rest collection) item)))))
       (true false))))
-;; Property-based is — check obj.key truthiness
-(define precedes? (fn (a b) (< (str a) (str b))))
 ;; Array slicing (inclusive both ends)
+(define precedes? (fn (a b) (< (str a) (str b))))
+;; Collection: sorted by
 (define
   hs-empty?
   (fn
@@ -447,7 +453,7 @@
       ((list? v) (= (len v) 0))
       ((dict? v) (= (len (keys v)) 0))
       (true false))))
-;; Collection: sorted by
+;; Collection: sorted by descending
 (define
   hs-empty-target!
   (fn
@@ -468,11 +474,11 @@
                   (dom-set-prop target "value" ""))))
             ((= tag "FORM") (dom-set-inner-html target ""))
             (true (dom-set-inner-html target ""))))))))
-;; Collection: sorted by descending
-(define hs-first (fn (lst) (first lst)))
 ;; Collection: split by
-(define hs-last (fn (lst) (last lst)))
+(define hs-first (fn (lst) (first lst)))
 ;; Collection: joined by
+(define hs-last (fn (lst) (last lst)))
+
 (define
   hs-template
   (fn