Step 17b: bytecode-compiled text-layout, WASM library import fix

- text-layout.sx added to WASM bytecode pipeline (9K compiled)
- Fix multi-list map calls (map-indexed + nth instead of map fn list1 list2)
- pretext-layout-lines and pretext-position-line moved to library exports
- Browser load-sxbc: handle VmSuspended for import, copy library exports
  to global_env after module load (define-library export fix)
- compile-modules.js: text-layout in SOURCE_MAP, FILES, and entry deps
- Island uses library functions (break-lines, pretext-layout-lines)
  instead of inlining — runs on bytecode VM when exports resolve

Known issue: define-library exports don't propagate to browser global env
yet. The load-sxbc import suspension handler resumes correctly but
bind_import_set doesn't fire. Needs deeper investigation into how the
WASM kernel's define-library registers exports vs how other libraries
(adapter-html, tw) make their exports available.

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

lib/hyperscript/compiler.sx

@@ -314,7 +314,10 @@
           (true
             (let
               ((t (hs-to-sx expr)))
-              (list (quote set!) t (list (quote +) t amount)))))))
+              (list
+                (quote set!)
+                t
+                (list (quote +) (list (quote or) t 0) amount)))))))
     (define
       emit-dec
       (fn
@@ -363,7 +366,10 @@
           (true
             (let
               ((t (hs-to-sx expr)))
-              (list (quote set!) t (list (quote -) t amount)))))))
+              (list
+                (quote set!)
+                t
+                (list (quote -) (list (quote or) t 0) amount)))))))
     (define
       emit-behavior
       (fn
@@ -801,8 +807,23 @@
                       (list (quote hs-query-all) (nth raw-tgt 1)))
                     (list
                       (quote dom-remove-class)
-                      (hs-to-sx raw-tgt)
+                      (if (nil? raw-tgt) (quote me) (hs-to-sx raw-tgt))
                       (nth ast 1)))))
+              ((= head (quote remove-element))
+                (list (quote dom-remove) (hs-to-sx (nth ast 1))))
+              ((= head (quote remove-attr))
+                (let
+                  ((tgt (if (nil? (nth ast 2)) (quote me) (hs-to-sx (nth ast 2)))))
+                  (list (quote dom-remove-attr) tgt (nth ast 1))))
+              ((= head (quote remove-css))
+                (let
+                  ((tgt (if (nil? (nth ast 2)) (quote me) (hs-to-sx (nth ast 2))))
+                    (props (nth ast 1)))
+                  (cons
+                    (quote do)
+                    (map
+                      (fn (p) (list (quote dom-set-style) tgt p ""))
+                      props))))
               ((= head (quote toggle-class))
                 (list
                   (quote hs-toggle-class!)