Restructure labels: detect-then-parse, named parsers, raw disc data

Architecture:
- Each BD-J format in own file: paramount.rs, criterion.rs, pixelogic.rs, ctrm.rs
- Standard interface: detect() → bool, parse() → Option<Vec<StreamLabel>>
- PARSERS array in mod.rs — drop in a new parser with one line
- Shared vocab.rs for BD spec codec names only (MLP→TrueHD, AC3→Dolby Digital)
- All other label data passes through raw from disc — no guessing

Changes:
- New: paramount.rs (playlists.xml — Paramount/onQ format)
- Renamed: bluray_project.rs → pixelogic.rs
- Renamed: stream_properties.rs → criterion.rs
- Merged: language_streams.rs + menu_base.rs → ctrm.rs
- Removed: jar module (superseded by labels), dead apply functions
- Added: DriveSession::eject() with PREVENT ALLOW MEDIUM REMOVAL
- Added: DiscRegion enum (Free/BluRay/Dvd)
- Fixed: capture sector ranges now include all files (only skip STREAM/)
- Renamed: StreamLabel.region → variant (not a BD spec field)

src/drive.rs

@@ -163,6 +163,22 @@ impl DriveSession {
         Ok(result.bytes_transferred)
     }
 
+    /// Eject the disc tray.
+    ///
+    /// Sends PREVENT ALLOW MEDIUM REMOVAL (allow) first to release any
+    /// locks, then START STOP UNIT with LoEj=1 to open the tray.
+    pub fn eject(&mut self) -> Result<()> {
+        // PREVENT ALLOW MEDIUM REMOVAL: allow removal
+        let allow_cdb = [0x1Eu8, 0, 0, 0, 0x00, 0];
+        let mut buf = [0u8; 0];
+        let _ = self.scsi.as_mut().execute(&allow_cdb, crate::scsi::DataDirection::None, &mut buf, 5_000);
+
+        // START STOP UNIT: LoEj=1, Start=0
+        let eject_cdb = [0x1Bu8, 0, 0, 0, 0x02, 0];
+        self.scsi.as_mut().execute(&eject_cdb, crate::scsi::DataDirection::None, &mut buf, 30_000)?;
+        Ok(())
+    }
+
     /// Execute a raw SCSI CDB. Used by parsers and AACS handshake.
     pub fn scsi_execute(
         &mut self,