deobfuscate: silence dead_code on Deobfuscator::has_sig/has_nsig

Public API methods exposed for downstream consumers (e.g. straw can
call deobf.has_sig() to skip cipher streams without observing an Err).
The internal short-circuit uses the struct field directly so the
methods register as unused at compile time.

src/deobfuscate.rs

@@ -197,11 +197,16 @@ impl Deobfuscator {
     }
 
     /// True when the underlying DeobfData had a valid sig fn extracted.
+    /// Exposed for consumers that want to short-circuit cipher streams
+    /// without invoking `deobfuscate_sig` and observing the error.
+    #[allow(dead_code)]
     pub fn has_sig(&self) -> bool {
         self.has_sig
     }
 
     /// True when the underlying DeobfData had a valid nsig fn extracted.
+    /// Exposed for consumers that want to short-circuit throttled URLs.
+    #[allow(dead_code)]
     pub fn has_nsig(&self) -> bool {
         self.has_nsig
     }