Import upstream v0.16.24, stripped

Upstream commit: af37a234981722493b74623a983581691d2b70b6
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 118 in 50 files
Dangling module declarations removed: 5
Edits turning enterprise off: 25
Third-party code: 14 files, 0 not in THIRD-PARTY.md
Renamed identifiers: 62 in 18 files
Verification: clean

The same Enterprise footprint as v0.16.23. The build check fails only on
tests/src/directory/issuer.rs, unchanged since v0.16.23: it calls a helper
from upstream's Enterprise-only OIDC test, and tests issuer-based directory
routing, an Enterprise feature. main has never carried it.

crates/spam-filter/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "spam-filter"
-version = "0.16.23"
+version = "0.16.24"
 edition = "2024"
 
 [dependencies]

crates/spam-filter/src/analysis/url.rs

@@ -203,7 +203,7 @@ impl SpamFilterAnalyzeUrl for Server {
 
                     if !ctx.result.has_tag("URL_REDIRECTOR_NESTED") {
                         let mut redirect_count = 1;
-                        let mut url_redirect = Cow::Borrowed(url.element.url.as_str());
+                        let mut url_redirect = url.element.request_url();
 
                         while redirect_count <= 3 {
                             match http_get_header(
@@ -224,7 +224,8 @@ impl SpamFilterAnalyzeUrl for Server {
                                         )
                                         .await
                                         {
-                                            url_redirect = Cow::Owned(location.url);
+                                            url_redirect =
+                                                Cow::Owned(location.request_url().into_owned());
                                             redirect_count += 1;
                                             continue;
                                         } else {
@@ -487,6 +488,15 @@ impl<'x> UrlParts<'x> {
                 .is_some_and(|url| url.host.fqdn.starts_with("www."))
     }
 
+    pub fn request_url(&self) -> Cow<'_, str> {
+        let url = self.url_original.trim();
+        if self.has_scheme {
+            Cow::Borrowed(url)
+        } else {
+            Cow::Owned([HTTPS_SCHEME, url].concat())
+        }
+    }
+
     fn parse(url: &str) -> Option<UrlParsed> {
         url.parse::<Uri>().ok().and_then(|parts| {
             parts
@@ -505,3 +515,19 @@ impl<'x> UrlParts<'x> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn request_url_keeps_case() {
+        let url = UrlParts::new(" https://Bit.ly/3AbCdEf ");
+        assert_eq!(url.url, "https://bit.ly/3abcdef");
+        assert_eq!(url.request_url(), "https://Bit.ly/3AbCdEf");
+
+        let url = UrlParts::no_scheme("Bit.ly/3AbCdEf");
+        assert_eq!(url.url, "https://bit.ly/3abcdef");
+        assert_eq!(url.request_url(), "https://Bit.ly/3AbCdEf");
+    }
+}

crates/spam-filter/src/modules/classifier.rs

@@ -257,9 +257,7 @@ impl SpamClassifier for Server {
                         remove_entries = true;
                     }
 
-                    if trainer.last_id == 0 {
-                        trainer.last_id = id;
-                    }
+                    trainer.last_id = trainer.last_id.max(id);
 
                     Ok(true)
                 },