dirty scan speed testing

bench/gen-corpus.sh

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+#!/usr/bin/env bash
+#
+# bench/gen-corpus.sh
+#
+# Generate a synthetic corpus of N files in nested directories.
+# Defaults to 1 000 files so it stays laptop-friendly.
+#
+
+set -euo pipefail
+IFS=$'\n\t'
+
+# How many files? (default: 1 000)
+COUNT=${COUNT:-100000}
+# Where to put them
+TARGET=${TARGET:-bench/corpus}
+
+# Wipe any old corpus
+rm -rf "$TARGET"
+mkdir -p "$TARGET"
+
+echo "🚀 Generating $COUNT files under $TARGET…"
+for i in $(seq 1 "$COUNT"); do
+  # bucket into 100 sub-dirs so walkdir has some structure
+  dir_index=$(( (i - 1) / (COUNT / 100 + 1) ))
+  subdir="$TARGET/dir$(printf "%03d" "$dir_index")"
+  mkdir -p "$subdir"
+  echo "This is file #$i" > "$subdir/file_$i.txt"
+done
+
+echo "✅ Done: $(find "$TARGET" -type f | wc -l) files created."