Add 6 VM/bytecode debugging and build tools

OCaml server commands:
- vm-trace: step-by-step bytecode execution trace (opcode, stack, depth)
- bytecode-inspect: disassemble compiled function (opcodes, constants, arity)
- deps-check: strict symbol resolution (resolved vs unresolved symbols)
- prim-check: verify CALL_PRIM opcodes match real primitives

Scripts:
- hosts/ocaml/browser/test_boot.sh: WASM boot test in Node.js
- scripts/sx-build-all.sh: full pipeline (OCaml + JS + tests)

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

hosts/ocaml/browser/test_boot.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# Test WASM boot in Node.js — verifies the compiled sx_browser.bc.js loads
+# without errors by providing minimal DOM/browser API stubs.
+set -euo pipefail
+
+cd "$(dirname "$0")/../../.."
+
+node -e "
+  global.window = global;
+  global.document = { createElement: () => ({style:{},setAttribute:()=>{},appendChild:()=>{},children:[]}), createDocumentFragment: () => ({appendChild:()=>{},children:[],childNodes:[]}), head:{appendChild:()=>{}}, body:{appendChild:()=>{}}, querySelector:()=>null, querySelectorAll:()=>[], createTextNode:(s)=>({textContent:s}), addEventListener:()=>{}, createComment:(s)=>({textContent:s||''}) };
+  global.localStorage = {getItem:()=>null,setItem:()=>{},removeItem:()=>{}};
+  global.CustomEvent = class { constructor(n,o){this.type=n;this.detail=(o||{}).detail||{}} };
+  global.MutationObserver = class { observe(){} disconnect(){} };
+  global.requestIdleCallback = (fn) => setTimeout(fn,0);
+  global.matchMedia = () => ({matches:false});
+  global.navigator = {serviceWorker:{register:()=>Promise.resolve()}};
+  global.location = {href:'',pathname:'/',hostname:'localhost'};
+  global.history = {pushState:()=>{},replaceState:()=>{}};
+  global.fetch = () => Promise.resolve({ok:true,text:()=>Promise.resolve('')});
+  global.setTimeout = setTimeout;
+  global.clearTimeout = clearTimeout;
+  try {
+    require('./shared/static/wasm/sx_browser.bc.js');
+    console.log('WASM boot: OK');
+  } catch(e) {
+    console.error('WASM boot: FAILED');
+    console.error(e.message);
+    process.exit(1);
+  }
+"