docs: rewrite rip-recovery + drive-access for 0.13.6 single-shot model

Updates docs/ to reflect the recovery-loop strip:
- rip-recovery.md: drops Phase 1/2/3 description, replaces with three-layer
  model (Disc::patch multi-pass / DiscStream batch halving / Drive::read
  single-shot). Notes that no SCSI resets fire from any retry path.
- drive-access.md: removes SG_SCSI_RESET + STOP/START UNIT escalation
  references; SgIoTransport::reset is now kernel SG_IO flush + ALLOW
  MEDIUM REMOVAL only.
- src/mux/disc.rs + tests/: cargo fmt cleanup.

src/mux/disc.rs

@@ -157,8 +157,7 @@ impl DiscStream {
         content_format: crate::disc::ContentFormat,
     ) -> Self {
         let extents = title.extents.clone();
-        let bytes_total_extents: u64 =
-            extents.iter().map(|e| e.sector_count as u64 * 2048).sum();
+        let bytes_total_extents: u64 = extents.iter().map(|e| e.sector_count as u64 * 2048).sum();
 
         let mut pids = Vec::new();
         let mut parsers = Vec::new();