chore(weave): Add import time benchmarking script

scripts/benchmark_import.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+
+import statistics
+import subprocess
+import sys
+
+from rich.console import Console
+from rich.progress import Progress, SpinnerColumn, TimeElapsedColumn
+from rich.table import Table
+
+
+def run_single_import():
+    cmd = """
+import time
+start = time.perf_counter()
+import weave
+end = time.perf_counter()
+print(end - start)
+"""
+    result = subprocess.run([sys.executable, "-c", cmd], capture_output=True, text=True)
+    return float(result.stdout)
+
+
+def benchmark(iterations=10):
+    console = Console()
+    times = []
+
+    with Progress(
+        SpinnerColumn(),
+        *Progress.get_default_columns(),
+        TimeElapsedColumn(),
+        console=console,
+    ) as progress:
+        task = progress.add_task("[cyan]Running import tests...", total=iterations)
+
+        for _ in range(iterations):
+            times.append(run_single_import())
+            progress.advance(task)
+
+    # Display results in a nice table
+    table = Table(title="Import Time Benchmark Results")
+    table.add_column("Metric", style="cyan")
+    table.add_column("Value", style="green")
+
+    table.add_row("Mean import time", f"{statistics.mean(times):.4f}s")
+    table.add_row("Median import time", f"{statistics.median(times):.4f}s")
+    table.add_row("Std dev", f"{statistics.stdev(times):.4f}s")
+    table.add_row("Min time", f"{min(times):.4f}s")
+    table.add_row("Max time", f"{max(times):.4f}s")
+
+    console.print("\n")
+    console.print(table)
+
+    # Show individual times
+    times_table = Table(title="Individual Import Times")
+    times_table.add_column("Run #", style="cyan")
+    times_table.add_column("Time (seconds)", style="green")
+
+    for i, t in enumerate(times, 1):
+        times_table.add_row(str(i), f"{t:.4f}")
+
+    console.print("\n")
+    console.print(times_table)
+
+
+if __name__ == "__main__":
+    benchmark()

tests/trace/test_import.py

@@ -0,0 +1,13 @@
+from pathlib import Path
+
+
+def test_import_not_slow(monkeypatch):
+    root_dir = Path.cwd().parent.parent  # root dir of repo
+    monkeypatch.setenv("PYTHONPATH", str(root_dir))
+
+    from scripts.benchmark_import import run_single_import
+
+    import_time = run_single_import()
+
+    # Ideally the import takes < 1s, but in CI it can take up to 3s.
+    assert import_time < 3, f"Import time was {import_time} seconds"