fix(daemon): park vanished grabs instead of re-grabbing

Overrides #86: removing a torrent by hand in Transmission is human
intent, not a gap to refill. Clear `wanted` and mark the target
`parked` (a new movies/episodes state) rather than reopening it as
`missing`, so neither targeted search nor RSS matching pick it back
up. Blacklist stays untouched, since the release never failed policy.

Closes #108

crates/arr-core/src/lib.rs

@@ -238,6 +238,9 @@ pub enum MediaState {
     Missing,
     Downloading,
     Available,
+    /// #108: `wanted` was cleared after the grab vanished from Transmission.
+    /// Distinct from `Missing` so it does not read as an open gap.
+    Parked,
 }
 
 #[derive(Clone, Debug, Eq, PartialEq)]