Numbered items of a set don't take the poster-tag rule

"ai-engineer-complete [401/465] - \"003 Defining Tools with JSON
Schema.mp4\"": the subject's text shares no word with the lesson's
descriptive name, so it was taken for a poster's constant tag and each of
the course's 465 files keyed a release of its own (releases 75941915,
75941916). A stem starting with a 1-3 digit index and a separator is an
item of a set the subject names, as audio tracks and images already
were; uploads hours apart stay apart by the re-upload rule. Both
implementations; tests; fixtures identical.

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

edge/src/names.rs

@@ -524,7 +524,13 @@ pub fn release_identity(poster: &str, subject: &str, name: &str) -> Release {
     }
     let image = test(&IMAGE, name);
     // The poster's constant tag outside the quotes: the file's stem says which upload it is (not for images and audio).
-    let tag = !image && !test(&AUDIO, name) && describes(&stem) && !looks_random(&stem) && is_poster_tag(&remainder, &stem);
+    // Not for numbered items of a set ("003 Defining Tools with JSON Schema.mp4"): /^\d{1,3}[ ._-]/.
+    let numbered = {
+        let b = stem.as_bytes();
+        let digits = b.iter().take_while(|c| c.is_ascii_digit()).count();
+        (1..=3).contains(&digits) && matches!(b.get(digits), Some(b' ' | b'.' | b'_' | b'-'))
+    };
+    let tag = !image && !numbered && !test(&AUDIO, name) && describes(&stem) && !looks_random(&stem) && is_poster_tag(&remainder, &stem);
     let prefix = if image { image_prefix(&stem) } else { String::new() };
     if !tag && names_release(&remainder) {
         let bound = counter_total(subject).unwrap_or_else(|| prefix.clone());
@@ -1004,4 +1010,18 @@ mod tests {
         assert_eq!(upload_tool("b94268bc702040f7b811d5318f727e4f@ngPost"), "ngPost");
         assert_eq!(upload_tool("x@y"), "other");
     }
+
+#[cfg(test)]
+mod numbered_tests {
+    use super::release_identity;
+
+    #[test]
+    fn numbered_items_of_a_set_stay_one_release() {
+        let poster = "Poster49118 <Poster49118@generic.mail>";
+        let a = release_identity(poster, r#"ai-engineer-complete [401/465] - "003 Defining Tools with JSON Schema.mp4" yEnc"#, "003 Defining Tools with JSON Schema.mp4");
+        let b = release_identity(poster, r#"ai-engineer-complete [422/465] - "006 ai-lesson-4-5-web-search-tools.zip" yEnc"#, "006 ai-lesson-4-5-web-search-tools.zip");
+        assert_eq!(a.key, b.key);
+        assert_eq!(a.name, "ai engineer complete");
+    }
+}
 }