Add disc title, format, streams to Disc::scan() — move logic from CLI to lib

- Disc.volume_id: UDF Volume ID from PVD (always present)
- Disc.meta_title: from META/DL/bdmt_eng.xml (falls back to other languages)
- Disc.format: UHD/BluRay/DVD detected from video codec
- Disc.capacity_bytes, Disc.layers
- Disc.jar_labels: extracted from BDMV/JAR
- Fixed MPLS STN parsing: 16-byte header (was 8), proper stream entry offsets
- Streams now include: HDR, color space, Dolby Vision EL, secondary audio/video
- parse_dstring() for UDF d-string fields
- wait_ready() polls TEST UNIT READY before unlock

Tested on 12 disc captures — all return correct titles, streams, format.

src/drive.rs

@@ -36,6 +36,7 @@ impl DriveSession {
     /// for sector reads, disc scanning, and content extraction.
     pub fn open(device: &Path) -> Result<Self> {
         let mut session = Self::open_no_unlock(device)?;
+        session.wait_ready()?;
         let _ = session.unlock(); // silently ignore — unencrypted discs don't need it
         Ok(session)
     }
@@ -85,6 +86,24 @@ impl DriveSession {
         })
     }
 
+    /// Wait for the drive to become ready (disc spun up).
+    /// Polls TEST UNIT READY up to 30 seconds.
+    pub fn wait_ready(&mut self) -> Result<()> {
+        let tur = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00]; // TEST UNIT READY
+        for _ in 0..60 {
+            let mut buf = [0u8; 0];
+            if self.scsi.as_mut().execute(
+                &tur, crate::scsi::DataDirection::None, &mut buf, 5000
+            ).is_ok() {
+                return Ok(());
+            }
+            std::thread::sleep(std::time::Duration::from_millis(500));
+        }
+        Err(Error::DeviceNotFound {
+            path: format!("{}: drive not ready after 30s", self.device_path),
+        })
+    }
+
     /// Device path this session was opened on.
     pub fn device_path(&self) -> &str {
         &self.device_path