Enforce feature isolation and expand copy_count test coverage

- Gate env_logger init behind #[cfg(feature = "bin-logging")] in
  records.rs main() so the binary respects the feature flag
- Set default-features = false on the dev-dependency self-reference
  in Cargo.toml; previously default features were silently re-enabled
  during tests, making feature isolation accidental rather than real
- Bind guid.to_string() once per card in user_data.rs deck loop and
  reuse it via clone, replacing three allocations per locked card
- Add per-field help text to the Track subcommand args clarifying
  human-readable names ("Laguna Seca", "Dry") vs raw codes
- Document write_details_csv DashMap snapshot memory tradeoff
  (full clone, roughly doubled peak memory during the write)
- Extend my_cars fixture test: duplicate guids count as 2 copies
  with per-copy configs, and incomplete-tune cards still count in
  copy_count

Cargo.toml

@@ -32,7 +32,7 @@ bin-logging = ["dep:env_logger"]
 test-utils = []
 
 [dev-dependencies]
-top_drives = { path = ".", features = ["test-utils"] }
+top_drives = { path = ".", features = ["test-utils"], default-features = false }
 tempfile = "3.10.1"
 proptest = "1"
 mockito = "1"