refactor: fix all compiler + clippy warnings

- analysis.rs: use .clamp() instead of .max().min(), saturating_sub,
  inline corner_start into corner_start_s (dead assignment removed)
- binary_utils.rs, parser_pcars.rs: use std::array::from_fn for array reads
- recording.rs: std::io::Error::other() instead of Error::new(ErrorKind::Other),
  #[allow(dead_code)] on diagnostic methods (len, total_pushed, dropped_count, ring_stats)
- track_model.rs: prefix unused path vars with _, #[allow(dead_code)] on exists()
- parser_ksudp.rs: fix doc list item indentation
- session.rs: std::mem::take instead of mem::replace(..., Default::default())

cargo build: 0 warnings, clippy: 0 warnings, 33 tests pass

src/parser_ksudp.rs

@@ -20,8 +20,10 @@
 //!
 //! IMPORTANT: The AC RTCarInfo C struct uses **natural alignment** (not packed).
 //! This means padding bytes exist:
-//!   - 3 bytes after `char identifier` (offset 0) before `int size` (offset 4)
-//!   - 2 bytes after the 6 bools (offsets 20–25) before the next float (offset 28)
+//!
+//! - 3 bytes after `char identifier` (offset 0) before `int size` (offset 4)
+//! - 2 bytes after the 6 bools (offsets 20-25) before the next float (offset 28)
+//!
 //! Total struct size: 328 bytes (not 323).
 
 use crate::binary_utils::{read_bool, read_f32, read_f32_4, read_i32};