On Windows, Zig's built-in libc and MSVC's CRT maintain separate
heaps, so calling free() on memory allocated by the library causes
undefined behavior. Add ghostty_free() that frees through the same
allocator that performed the allocation, making it safe on all
platforms.
Update format_alloc docs and all examples to use ghostty_free()
instead of free().
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add an example showing how to use the ghostty-vt terminal and
formatter APIs from C. The example creates a terminal, writes
VT-encoded content with cursor movement and styling sequences,
then formats the screen contents as plain text using the formatter
API.
