fix: add Char variant to value_type_id match

The codetracer_trace_types 0.16.3 added a Char variant to ValueRecord.
The value_type_id match was missing this variant, causing a
non-exhaustive pattern error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: zah

gems/codetracer-ruby-recorder/ext/native_tracer/src/lib.rs

@@ -137,6 +137,7 @@ fn value_type_id(val: &ValueRecord) -> TypeId {
         | Raw { type_id, .. }
         | Error { type_id, .. }
         | BigInt { type_id, .. }
+        | Char { type_id, .. }
         | None { type_id } => *type_id,
         Cell { .. } => NONE_TYPE_ID,
     }