Move stdlib out of spec — clean spec/library boundary

spec/ now contains only the language definition (5 files):
  evaluator.sx, parser.sx, primitives.sx, render.sx, special-forms.sx

lib/ contains code written IN the language (8 files):
  stdlib.sx, types.sx, freeze.sx, content.sx,
  bytecode.sx, compiler.sx, vm.sx, callcc.sx

Test files follow source: spec/tests/ for core language tests,
lib/tests/ for library tests (continuations, freeze, types, vm).

Updated all consumers:
- JS/Python/OCaml bootstrappers: added lib/ to source search paths
- OCaml bridge: spec_dir for parser/render, lib_dir for compiler/freeze
- JS test runner: scans spec/tests/ (always) + lib/tests/ (--full)
- OCaml test runner: scans spec/tests/, lib tests via explicit request
- Docker dev mounts: added ./lib:/app/lib:ro

Tests: 1041 JS standard, 1322 JS full, 1101 OCaml — all pass

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

shared/static/scripts/sx-browser.js

@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-24T22:31:01Z";
+  var SX_VERSION = "2026-03-24T22:56:21Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }

shared/sx/ocaml_bridge.py

@@ -367,17 +367,24 @@ class OcamlBridge:
             # Collect files to load
             all_files: list[str] = []
 
-            # Spec files needed by aser + bytecode compiler
+            # Core spec files
             spec_dir = os.path.join(os.path.dirname(__file__), "../../spec")
-            for spec_file in ["parser.sx", "render.sx", "bytecode.sx", "compiler.sx"]:
+            for spec_file in ["parser.sx", "render.sx"]:
                 path = os.path.normpath(os.path.join(spec_dir, spec_file))
                 if os.path.isfile(path):
                     all_files.append(path)
 
+            # Library files (compiler, vm, freeze — written in the language)
+            lib_dir = os.path.join(os.path.dirname(__file__), "../../lib")
+            for lib_file in ["bytecode.sx", "compiler.sx"]:
+                path = os.path.normpath(os.path.join(lib_dir, lib_file))
+                if os.path.isfile(path):
+                    all_files.append(path)
+
             # All directories loaded into the Python env
             all_dirs = list(set(_watched_dirs) | _dirs_from_cache)
 
-            # Isomorphic libraries: signals, rendering, freeze scopes, web forms
+            # Isomorphic libraries: signals, rendering, web forms
             web_dir = os.path.join(os.path.dirname(__file__), "../../web")
             if os.path.isdir(web_dir):
                 for web_file in ["signals.sx", "adapter-html.sx", "adapter-sx.sx",
@@ -385,9 +392,9 @@ class OcamlBridge:
                     path = os.path.normpath(os.path.join(web_dir, web_file))
                     if os.path.isfile(path):
                         all_files.append(path)
-            # Spec library files (loaded after adapters)
-            for spec_lib in ["freeze.sx"]:
-                path = os.path.normpath(os.path.join(spec_dir, spec_lib))
+            # Library files loaded after adapters (depend on scope primitives)
+            for lib_file in ["freeze.sx"]:
+                path = os.path.normpath(os.path.join(lib_dir, lib_file))
                 if os.path.isfile(path):
                     all_files.append(path)