fix: Complete resource handle lifecycle

[GordonSmith]

No description provided.

[Copilot]

Pull Request Overview

This PR implements resource handle lifecycle management for the WebAssembly Component Model, completing one of the major features outlined in the canonical ABI specification. The implementation adds proper resource handle tables, ownership tracking, and lifecycle management functions.

Key changes include:

• Adds complete resource handle infrastructure with ownership tracking and borrow counting
• Implements canonical resource management functions (canon_resource_new, canon_resource_drop, canon_resource_rep)
• Moves and enhances trap_if utility function to the context header where it's more logically placed

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
include/cmcpp/context.hpp	Core implementation of resource handle tables, lifecycle management, and canonical resource functions
include/cmcpp.hpp	Adds context.hpp to public API surface
include/cmcpp/util.hpp	Removes trap_if function (moved to context.hpp)
test/main.cpp	Comprehensive test coverage for resource handle lifecycle behavior
docs/issue-backlog.md	Documents planned enhancements and implementation roadmap

[Copilot]

The <stdexcept> include appears to be unused in the test file. The std::runtime_error is used in the lambda on line 216, but this could be replaced with the existing trap mechanism for consistency.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.04%. Comparing base (af57bb6) to head (283f22d).

Files with missing lines	Patch %	Lines
include/cmcpp/context.hpp	94.11%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk      #12      +/-   ##
==========================================
+ Coverage   85.27%   86.04%   +0.77%     
==========================================
  Files          15       15              
  Lines         618      681      +63     
  Branches       39       43       +4     
==========================================
+ Hits          527      586      +59     
- Misses         71       73       +2     
- Partials       20       22       +2     

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