Docs | Define ownership rules per C API string-returning function

[AnnaSasDev]

What is unclear or missing?

Current C API comment says all returned strings must be freed, but implementation mixes owned and borrowed pointers.

Suggested improvement

Document ownership per function (owned, borrowed, caller-frees) and align to implementation or adjust implementation to match docs.

Additional context

Contract location: src/InfiniFrame.Native/Exports.cpp:19
Affected APIs include:
InfiniFrame_GetUserAgent, InfiniFrame_GetTitle, InfiniFrame_GetIconFileName