Fix HS browser activation: host-get function sentinel, runtime symbol shadow, lazy dep chain

Three bugs fixed:
1. host-get in sx-platform.js: return true for function-valued properties
   so dom-get-attr/dom-set-attr guards pass (functions can't cross WASM boundary)
2. hs-runtime.sx: renamed host-get→hs-host-get and dom-query→hs-dom-query to
   stop shadowing platform natives when loaded as .sx source
3. compile-modules.js: HS dependency chain (integration→runtime→compiler→parser→tokenizer)
   so lazy loading pulls in all deps. Non-library modules load as .sx source
   for CEK env visibility.

Result: 8/8 elements activate, hs-on attaches listeners. Click handler needs
IO suspension support (VmSuspended in sx_browser.ml) to fire — next step.

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

hosts/ocaml/browser/compile-modules.js

@@ -382,9 +382,16 @@ for (const file of FILES) {
     const defines = extractDefines(src);
     if (defines.length > 0) {
       const key = file.replace(/\.sx$/, '');
+      // HS modules form a dependency chain — loading one loads all predecessors.
+      const HS_DEPS = {
+        'hs-parser': ['hs-tokenizer'],
+        'hs-compiler': ['hs-tokenizer', 'hs-parser'],
+        'hs-runtime': ['hs-tokenizer', 'hs-parser', 'hs-compiler'],
+        'hs-integration': ['hs-tokenizer', 'hs-parser', 'hs-compiler', 'hs-runtime'],
+      };
       manifest[key] = {
         file: sxbcFile,
-        deps: [],
+        deps: HS_DEPS[key] || [],
         exports: defines,
       };
     }