Old rar volumes: .s–.v only, not .x64/.x86

d4e53ca's .[s-z]NN took "Electric.Rain.Swift.3D.PS.v1.0.142.x64" for a
volume, so x86 and x64 builds would be one release.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

edge/src/names.rs

@@ -68,8 +68,8 @@ pub fn file_stem_re(name: &str) -> String {
     stem
 }
 
-/// Old-style rar volumes after .r99, as the file's own extension, lower case: /\.[s-z]\d{2}$/.
-static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.[s-z][0-9]{2}$"));
+/// Old-style rar volumes after .r99, as the file's own extension, lower case, not x or z (".x64"): /\.[s-v]\d{2}$/.
+static OLD_RAR_VOLUME: LazyLock<Regex> = LazyLock::new(|| re(r"\.[s-v][0-9]{2}$"));
 static QUOTED: LazyLock<Regex> = LazyLock::new(|| re(r#""[^"]*""#));
 static COUNTERS: LazyLock<Regex> = LazyLock::new(|| re(r"\[[0-9]+/[0-9]+\]|\([0-9]+/[0-9]+\)"));
 static YENC_END: LazyLock<Regex> = LazyLock::new(|| re(r"(?i)\byEnc\b(SP+[0-9]+)?SP*$"));
@@ -216,7 +216,7 @@ pub fn file_stem(name: &str) -> String {
     let b = stem.as_bytes();
     let mut len = b.len();
     // Old-style rar volumes after .r99 (".s41"), as the file's own extension, lower case.
-    if len >= 4 && b[len - 4] == b'.' && (b's'..=b'z').contains(&b[len - 3]) && b[len - 2..].iter().all(u8::is_ascii_digit) {
+    if len >= 4 && b[len - 4] == b'.' && (b's'..=b'v').contains(&b[len - 3]) && b[len - 2..].iter().all(u8::is_ascii_digit) {
         len -= 4;
     }
     let mut changed = true;
@@ -1427,6 +1427,7 @@ mod image_set_tests {
             ("x8ZRmX5N83mrokOwqJtoIGHTrqXQrgCyj.s00", "x8ZRmX5N83mrokOwqJtoIGHTrqXQrgCyj"),
             ("the.office.us.s01.rar", "the.office.us.s01"),
             ("Some.Show.S01", "Some.Show.S01"),
+            ("Electric.Rain.Swift.3D.PS.v1.0.142.x64", "Electric.Rain.Swift.3D.PS.v1.0.142.x64"),
             ("chappelle1.part02.rev", "chappelle1"),
             ("chappelle1.rev", "chappelle1"),
             ("VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2", "VwE3i90MVX9dqMFuDfzdS7Q6"),