chore: add benchmark analysis scripts

check_lengths.py

@@ -0,0 +1,47 @@
+import csv
+
+def check_lengths(filename, label):
+    lengths = []
+    failed = 0
+    total = 0
+    with open(filename, 'r') as f:
+        reader = csv.reader(f)
+        next(reader)
+        for row in reader:
+            if not row or row[0].startswith('#'):
+                continue
+            total += 1
+            try:
+                length = int(row[2])
+                lengths.append(length)
+                if length == 0:
+                    failed += 1
+            except:
+                pass
+    
+    print(f"\n=== {label} ===")
+    print(f"Total paths: {total}")
+    print(f"Failed paths (length=0): {failed} ({100*failed/total if total else 0:.1f}%)")
+    print(f"Paths with length > 0: {total - failed}")
+    
+    if lengths:
+        avg = sum(lengths) / len(lengths)
+        print(f"Avg length (all): {avg:.1f}")
+        nonzero = [l for l in lengths if l > 0]
+        if nonzero:
+            print(f"Avg length (non-zero): {sum(nonzero)/len(nonzero):.1f}")
+            print(f"Max length: {max(lengths)}")
+    
+    # Length buckets
+    print("\nLength distribution:")
+    buckets = [(0, 0), (1, 5), (6, 10), (11, 50), (51, 100), (100, 1000)]
+    for lo, hi in buckets:
+        if lo == hi == 0:
+            count = sum(1 for l in lengths if l == 0)
+        else:
+            count = sum(1 for l in lengths if lo <= l <= hi)
+        pct = 100*count/len(lengths) if lengths else 0
+        print(f"  {lo}-{hi if hi < 1000 else 'inf'} nodes: {count} ({pct:.1f}%)")
+
+check_lengths("/home/popertots/bench/pathfinding_benchmark_baseline_release.csv", "BASELINE")
+check_lengths("pathfinding_benchmark_current.csv", "CURRENT")