HS: behavior suite fixes — host-call-fn K.callFn try-catch + 20s deadline

host-call-fn: the K.callFn path had no try-catch, so SX exceptions from
behavior handlers (compiled via K.callFn) propagated through SX guard
frames as JS errors. Add try-catch that swallows non-TIMEOUT errors and
re-throws TIMEOUT (matching the fn.apply path).

_SLOW_DEADLINE_SUITES: behavior tests legitimately take 10-20s per test
(behavior script compilation + install + init). Extend their deadline from
the default 10s to 20s so they pass rather than wall-clock timeout.

Net: hs-upstream-behavior 10/10 (+5 previously timing out).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/hs-run-filtered.js

@@ -585,7 +585,7 @@ K.registerNative('host-get',a=>{
 });
 K.registerNative('host-set!',a=>{if(a[0]!=null){const v=a[2]; if(a[1]==='innerHTML'&&a[0] instanceof El){const s=v===null?'null':v===undefined?'':String(v);a[0]._setInnerHTML(s);a[0][a[1]]=a[0].innerHTML;} else if(a[1]==='textContent'&&a[0] instanceof El){const s=v===null?'null':v===undefined?'':String(v);a[0].textContent=s;a[0].innerHTML=s;for(const c of a[0].children){c.parentElement=null;c.parentNode=null;}a[0].children=[];a[0].childNodes=[];} else{a[0][a[1]]=v;}} return a[2];});
 K.registerNative('host-call',a=>{if(_testDeadline&&Date.now()>_testDeadline)throw new Error('TIMEOUT: wall clock exceeded');const[o,m,...r]=a;if(o==null){const f=globalThis[m];return typeof f==='function'?f.apply(null,r):null;}if(o&&typeof o[m]==='function'){try{const v=o[m].apply(o,r);return v===undefined?null:v;}catch(e){return null;}}return null;});
-K.registerNative('host-call-fn',a=>{const[fn,argList]=a;if(typeof fn!=='function'&&!(fn&&fn.__sx_handle!==undefined))return null;const callArgs=(argList&&argList._type==='list'&&argList.items)?Array.from(argList.items):(Array.isArray(argList)?argList:[]);if(fn&&fn.__sx_handle!==undefined)return K.callFn(fn,callArgs);function sxToJs(v){if(v&&v._type==='list'&&v.items)return Array.from(v.items).map(sxToJs);return v;}try{const v=fn.apply(null,callArgs.map(sxToJs));return v===undefined?null:v;}catch(e){return null;}});
+K.registerNative('host-call-fn',a=>{const[fn,argList]=a;if(typeof fn!=='function'&&!(fn&&fn.__sx_handle!==undefined))return null;const callArgs=(argList&&argList._type==='list'&&argList.items)?Array.from(argList.items):(Array.isArray(argList)?argList:[]);if(fn&&fn.__sx_handle!==undefined){try{return K.callFn(fn,callArgs);}catch(e){const msg=e&&e.message||'';if(String(msg).includes('TIMEOUT'))throw e;return null;}}function sxToJs(v){if(v&&v._type==='list'&&v.items)return Array.from(v.items).map(sxToJs);return v;}try{const v=fn.apply(null,callArgs.map(sxToJs));return v===undefined?null:v;}catch(e){return null;}});
 K.registerNative('host-new',a=>{const C=typeof a[0]==='string'?globalThis[a[0]]:a[0];return typeof C==='function'?new C(...a.slice(1)):null;});
 K.registerNative('host-callback',a=>{const fn=a[0];if(typeof fn==='function'&&fn.__sx_handle===undefined)return fn;if(fn&&fn.__sx_handle!==undefined)return function(){const r=K.callFn(fn,Array.from(arguments));if(globalThis._driveAsync)globalThis._driveAsync(r);return r;};return function(){};});
 K.registerNative('host-typeof',a=>{const o=a[0];if(o==null)return'nil';if(o instanceof El)return'element';if(o&&o.nodeType===3)return'text';if(o instanceof Ev)return'event';if(o instanceof Promise)return'promise';return typeof o;});
@@ -859,6 +859,7 @@ for(let i=startTest;i<Math.min(endTest,testCount);i++){
     "hs-upstream-core/runtimeErrors": 30000,
     "hs-upstream-expressions/collectionExpressions": 60000,
     "hs-upstream-expressions/typecheck": 30000,
+    "hs-upstream-behavior": 20000,
   };
   _testDeadline = Date.now() + (_SLOW_DEADLINE[name] || _SLOW_DEADLINE_SUITES[suite] || 10000);
   globalThis.__hs_deadline = _testDeadline; // expose to WASM cek_step_loop