Fix build errors: use std::move for set_value() calls

Fixed template deduction issues where set_value() was being called
with lvalue references, causing TypeTraits specialization errors.
Changed all problematic calls to use std::move() to ensure correct
non-reference type deduction.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

examples/file_format/file-format-example.cc

@@ -158,7 +158,7 @@ static bool MyRead(const tinyusdz::Asset &asset,
   memcpy(&val, asset.data(), 4);
 
   tinyusdz::Attribute attr;
-  attr.set_value(val);
+  attr.set_value(std::move(val));
   attr.set_name("myval");
   attr.variability() = tinyusdz::Variability::Uniform;