Delete evaluator.py shim: all imports go directly to bootstrapped sx_ref.py

EvalError moved to types.py. All 27 files updated to import eval_expr,
trampoline, call_lambda, etc. directly from shared.sx.ref.sx_ref instead
of through the evaluator.py indirection layer. 320/320 spec tests pass.

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

shared/sx/ref/bootstrap_test.py

@@ -143,7 +143,7 @@ def _emit_py(suites: list[dict], preamble: list) -> str:
     lines.append('')
     lines.append('import pytest')
     lines.append('from shared.sx.parser import parse_all')
-    lines.append('from shared.sx.evaluator import _eval, _trampoline')
+    lines.append('from shared.sx.ref.sx_ref import eval_expr as _eval, trampoline as _trampoline')
     lines.append('')
     lines.append('')
     lines.append(f"_PREAMBLE = '''{preamble_escaped}'''")

shared/sx/ref/platform_py.py

@@ -600,7 +600,7 @@ def sx_expr_source(x):
 
 
 try:
-    from shared.sx.evaluator import EvalError
+    from shared.sx.types import EvalError
 except ImportError:
     class EvalError(Exception):
         pass

shared/sx/ref/reader_z3.py

@@ -39,7 +39,7 @@ def _get_z3_env() -> dict[str, Any]:
         return _z3_env
 
     from shared.sx.parser import parse_all
-    from shared.sx.evaluator import make_env, _eval, _trampoline
+    from shared.sx.ref.sx_ref import make_env, eval_expr as _eval, trampoline as _trampoline
 
     env = make_env()
     z3_path = os.path.join(os.path.dirname(__file__), "z3.sx")
@@ -60,7 +60,7 @@ def z3_translate(expr: Any) -> str:
 
     Delegates to z3-translate defined in z3.sx.
     """
-    from shared.sx.evaluator import _trampoline, _call_lambda
+    from shared.sx.ref.sx_ref import trampoline as _trampoline, call_lambda as _call_lambda
 
     env = _get_z3_env()
     return _trampoline(_call_lambda(env["z3-translate"], [expr], env))
@@ -72,7 +72,7 @@ def z3_translate_file(source: str) -> str:
     Delegates to z3-translate-file defined in z3.sx.
     """
     from shared.sx.parser import parse_all
-    from shared.sx.evaluator import _trampoline, _call_lambda
+    from shared.sx.ref.sx_ref import trampoline as _trampoline, call_lambda as _call_lambda
 
     env = _get_z3_env()
     exprs = parse_all(source)

shared/sx/ref/run_js_sx.py

@@ -49,7 +49,7 @@ def load_js_sx() -> dict:
 
     exprs = parse_all(source)
 
-    from shared.sx.evaluator import evaluate, make_env
+    from shared.sx.ref.sx_ref import evaluate, make_env
 
     env = make_env()
     for expr in exprs:
@@ -74,7 +74,7 @@ def compile_ref_to_js(
         spec_modules: List of spec modules (deps, router, signals). None = auto.
     """
     from datetime import datetime, timezone
-    from shared.sx.evaluator import evaluate
+    from shared.sx.ref.sx_ref import evaluate
 
     ref_dir = _HERE
     env = load_js_sx()

shared/sx/ref/run_py_sx.py

@@ -38,7 +38,7 @@ def load_py_sx(evaluator_env: dict) -> dict:
     exprs = parse_all(source)
 
     # Import the evaluator
-    from shared.sx.evaluator import evaluate, make_env
+    from shared.sx.ref.sx_ref import evaluate, make_env
 
     env = make_env()
     for expr in exprs:
@@ -60,7 +60,7 @@ def extract_defines(source: str) -> list[tuple[str, list]]:
 
 
 def main():
-    from shared.sx.evaluator import evaluate
+    from shared.sx.ref.sx_ref import evaluate
 
     # Load py.sx into evaluator
     env = load_py_sx({})

shared/sx/ref/sx_ref.py

@@ -559,7 +559,7 @@ def sx_expr_source(x):
 
 
 try:
-    from shared.sx.evaluator import EvalError
+    from shared.sx.types import EvalError
 except ImportError:
     class EvalError(Exception):
         pass