edge-bench --group: a range after a gap starts its batch at the range

a.b.storage's stored 2016 ranges are not contiguous (its 2016 window lies in two
article regions); the batch after a gap kept the previous range's end as its
start and the harness found no leased range for it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

edge/src/main.rs

@@ -292,6 +292,10 @@ fn main() {
     for (ri, range) in ranges.iter().enumerate() {
         let range_wall = Instant::now();
         let headers_before = out.0;
+        // After a gap between stored ranges the batch starts at this range (every range ends with a batch taken).
+        if ri > 0 {
+            indexer.skip_to(range.start);
+        }
         let mut files: Vec<String> = std::fs::read_dir(&range.dir).unwrap().map(|e| e.unwrap().file_name().into_string().unwrap()).filter(|f| f.ends_with(".gz")).collect();
         files.sort();
         for (i, file) in files.iter().enumerate() {