Add Graph::trace_assertion_failure and fix duplicate error_message symbol

[Kyle-Ye]

Summary

• Add Graph::trace_assertion_failure(bool, const char*, ...) declaration and stub implementation
• Wire trace_assertion_failure calls into precondition_failure (with true) and non_fatal_precondition_failure (with false), matching the original AG binary
• Remove dead #if OAG_TARGET_RELEASE >= OAG_RELEASE_2023 guard that was never defined
• Make error_message static to avoid duplicate symbol error when linked with OpenRenderBox

Test plan

• swift build passes

[augmentcode]

🤖 Augment PR Summary

Summary: Introduces a new Graph::trace_assertion_failure(bool, const char*, ...) API and wires it into precondition_failure/non_fatal_precondition_failure to mirror the original AG behavior.

Changes: Removes an unused release-guard and makes error_message file-local (static) to avoid duplicate symbol link errors.

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[augmentcode]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.08%. Comparing base (9b0ce6c) to head (be46a7a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenAttributeGraphCxx/Misc/assert.cpp	0.00%	2 Missing ⚠️
...es/OpenAttributeGraphCxx/Graph/OAGGraphTracing.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #220   +/-   ##
=======================================
  Coverage   32.08%   32.08%           
=======================================
  Files          70       70           
  Lines        2596     2596           
=======================================
  Hits          833      833           
  Misses       1763     1763           

Flag	Coverage Δ
ios	32.10% <0.00%> (ø)
macos	9.95% <ø> (ø)
ubuntu	11.79% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...hCxx/include/OpenAttributeGraphCxx/Graph/Graph.hpp	26.31% <ø> (ø)
...es/OpenAttributeGraphCxx/Graph/OAGGraphTracing.cpp	80.00% <0.00%> (-20.00%)	⬇️
Sources/OpenAttributeGraphCxx/Misc/assert.cpp	0.00% <0.00%> (ø)

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