Add structured compiler diagnostics

tools/milestone0_baseline.py

@@ -144,6 +144,12 @@ This deterministic benchmark content exists only in a disposable temporary direc
         )
 
 
+def write_synthetic_project(root: Path, node_count: int) -> None:
+    """Create the shared disposable generic benchmark fixture."""
+
+    _write_project(root, node_count)
+
+
 def _json_size(value: object) -> int | None:
     if value is None:
         return None
@@ -183,6 +189,29 @@ def _measure(
     return result, last
 
 
+def measure_operation(
+    operation: Callable[[], object],
+    *,
+    samples: int,
+    warmups: int = 1,
+    response_size: bool = True,
+) -> tuple[dict[str, object], object]:
+    """Measure one operation using the shared baseline method."""
+
+    return _measure(
+        operation,
+        samples=samples,
+        warmups=warmups,
+        response_size=response_size,
+    )
+
+
+def synthetic_node_id(index: int) -> str:
+    """Return one deterministic node identifier from the shared fixture."""
+
+    return _node_id(index)
+
+
 def _run(command: list[str]) -> str:
     return subprocess.run(
         command,