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>

shared/static/wasm/sx/module-manifest.json

@@ -618,6 +618,29 @@
       "tw-process-token"
     ]
   },
+  "sx text-layout": {
+    "file": "text-layout.sxbc",
+    "deps": [],
+    "exports": [
+      "measure-text",
+      "line-badness",
+      "compute-demerits",
+      "sum-widths",
+      "find-breaks",
+      "break-lines",
+      "break-lines-greedy",
+      "position-line",
+      "position-lines",
+      "pretext-position-line",
+      "pretext-layout-lines",
+      "layout-paragraph",
+      "make-hyphenation-trie",
+      "find-hyphenation-points",
+      "hyphenate-word",
+      "typeset",
+      "typeset-plain"
+    ]
+  },
   "web boot-helpers": {
     "file": "boot-helpers.sxbc",
     "deps": [
@@ -1039,7 +1062,8 @@
       "web router",
       "web page-helpers",
       "web orchestration",
-      "sx render"
+      "sx render",
+      "sx text-layout"
     ],
     "lazy_deps": [
       "sx bytecode",