fix: use not importing and generating

[GordonSmith]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes the code generator to properly handle WIT use statements by expanding support for cross-interface and cross-namespace type imports, rather than only generating using declarations for same-namespace imports.

• Removes restrictions that prevented cross-interface use statements from generating using declarations
• Adds support for type renaming in use statements via type_renames mapping
• Implements proper namespace qualification for cross-namespace references (host vs guest)

[github-actions]

Ubuntu Test Results

wit-stub-generation-test Results

This test is expected to have failures due to known issues with tuple wrapper types.

Compilation Summary

Metric	Value
Total targets	37
✅ Passed	35 (94.6%)
❌ Failed	2 (5.4%)
Total errors	114

Error Breakdown

Error Type	Count
std::get<> function call errors	0
result_ok_wrapper related	144
result_err_wrapper related	144
Missing file errors	2

Sample Errors

/home/runner/work/component-model-cpp/component-model-cpp/test/../include/cmcpp/variant.hpp:32:48: error: no match for ‘operator=’ (operand types are ‘std::variant<std::monostate, std::monostate>’ and ‘std::monostate’)
/home/runner/work/component-model-cpp/component-model-cpp/test/../include/cmcpp/variant.hpp:32:48: error: no match for ‘operator=’ (operand types are ‘std::variant<std::monostate, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, cmcpp::record_t<host::variants::empty_data>, std::monostate, unsigned int, float>’ and ‘std::monostate’)
/usr/include/c++/13/tuple:2303:42: error: no matching function for call to ‘get<0>(cmcpp::result_err_wrapper<std::tuple<unsigned int> >&)’
/usr/include/c++/13/tuple:2303:42: error: no matching function for call to ‘get<0>(cmcpp::result_ok_wrapper<std::tuple<unsigned int> >&)’
/usr/include/c++/13/tuple:2303:42: error: type/value mismatch at argument 1 in template parameter list for ‘template<class _Tp, class ... _Types> constexpr _Tp& std::get(tuple<_UTypes ...>&)’

Known Issues

The main issue is that result_ok_wrapper and result_err_wrapper types don't support std::get<> operations needed for tuple unpacking in generated code.

Goal: These failures should ideally decrease over time or remain stable. Any increase warrants investigation.

---

Updated: 2025-10-14T04:53:30.864Z

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.13%. Comparing base (3934d24) to head (974b2e8).

Files with missing lines	Patch %	Lines
include/cmcpp/string.hpp	75.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files          21       21           
  Lines        1537     1537           
  Branches      131      131           
=======================================
  Hits         1201     1201           
  Misses        236      236           
  Partials      100      100           

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