Steps 7 and 8: torrents, OPML, and polish

librqbit replaces the vendored BitTorrent 4.2.1 tree. Torrents download
in place because seeding serves the files it downloaded, so the planned
stage-then-move would have broken it. The stall budget now also covers
magnet metadata resolution, which otherwise never returns against a dead
swarm and wedged the scan.

Adds add/rm/import/export, tracing setup, systemd units and README.

A successful swarm download is unverified: no reachable peers here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RPyeapneuXrCdojsaiXGbe

src/feed.rs

@@ -9,10 +9,7 @@ use crate::config::Feed as FeedCfg;
 #[derive(Debug, Default)]
 pub struct ParsedFeed {
     pub title: Option<String>,
-    pub link: Option<String>,
     pub ttl_mins: Option<u64>,
-    /// Feed-level explicit flag; per the original, it overrides the entry level.
-    pub explicit: bool,
     pub entries: Vec<Entry>,
 }
 
@@ -148,9 +145,7 @@ fn from_rss(ch: rss::Channel) -> ParsedFeed {
 
     ParsedFeed {
         title: non_empty(Some(ch.title())),
-        link: non_empty(Some(ch.link())),
         ttl_mins: ch.ttl().and_then(|t| t.trim().parse().ok()),
-        explicit,
         entries,
     }
 }
@@ -205,13 +200,7 @@ fn from_atom(feed: atom_syndication::Feed) -> ParsedFeed {
 
     ParsedFeed {
         title: non_empty(Some(feed.title().as_str())),
-        link: feed
-            .links()
-            .iter()
-            .find(|l| l.rel() == "alternate")
-            .map(|l| l.href().to_owned()),
         ttl_mins: None,
-        explicit: false,
         entries,
     }
 }
@@ -261,7 +250,6 @@ mod tests {
 
         assert_eq!(feed.title.as_deref(), Some("Test Cast"));
         assert_eq!(feed.ttl_mins, Some(45));
-        assert!(!feed.explicit, "feed-level explicit is 'no'");
         assert_eq!(feed.entries.len(), 3);
 
         let ep = &feed.entries[0];
@@ -296,8 +284,10 @@ mod tests {
         <enclosure url="https://x/a.mp3" length="1" type="audio/mpeg"/></item>
         </channel></rss>"#;
         let feed = parse(xml).unwrap();
-        assert!(feed.explicit);
-        assert!(feed.entries[0].explicit, "feed level must win");
+        assert!(
+            feed.entries[0].explicit,
+            "the entry says nothing; the feed-level flag must still mark it explicit"
+        );
     }
 
     #[test]