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>

scripts/sx-build-all.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Full SX build pipeline — OCaml + JS browser + JS test + JS tests.
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+echo "=== OCaml build ==="
+(cd hosts/ocaml && eval $(opam env 2>/dev/null) && dune build) || { echo "FAIL: OCaml build"; exit 1; }
+echo "=== JS browser build ==="
+python3 hosts/javascript/cli.py --output shared/static/scripts/sx-browser.js || { echo "FAIL: JS build"; exit 1; }
+echo "=== JS test build ==="
+python3 hosts/javascript/cli.py --extensions continuations --spec-modules types --output shared/static/scripts/sx-full-test.js || { echo "FAIL: test build"; exit 1; }
+echo "=== JS tests ==="
+node hosts/javascript/run_tests.js --full 2>&1 | tail -3 || { echo "FAIL: JS tests"; exit 1; }
+echo "=== All OK ==="