fix: correct rules_cc 0.2.0 compatibility_proxy extension name

- Fix extension name from 'compatibility_proxy_repo' to 'compatibility_proxy'
- Remove invalid tag class call compatibility_proxy_repo()
- Resolves Linux CI toolchain resolution failures
- Tested: builds successfully with correct extension names

Author: avrabe

MODULE.bazel

@@ -112,8 +112,7 @@ cc_configure = use_extension("@rules_cc//cc:extensions.bzl", "cc_configure")
 use_repo(cc_configure, "local_config_cc")
 
 # Add compatibility proxy repository for rules_cc 0.2.0 (required for bzlmod)
-cc_compatibility = use_extension("@rules_cc//cc:extensions.bzl", "compatibility_proxy_repo") 
-cc_compatibility.compatibility_proxy_repo()
+cc_compatibility = use_extension("@rules_cc//cc:extensions.bzl", "compatibility_proxy")
 
 # Register both WASI SDK and C++ toolchains  
 register_toolchains(