Update SPM binary target for v0.3.0

Update SPM binary target for v0.2.7

Restore link directive in modulemap and add linkerSettings to SpeechM…

Update SPM binary target for v0.2.5

Remove link directive from CSpeechMarkdown modulemap

The link directive causes linker errors in Xcode — the .a is inside the
binary target and not on the library search path. Xcode's SPM binary
target mechanism handles linking automatically.

Update SPM binary target for v0.2.3

Fix xcframework build: separate lib/ and headers/ dirs

Previously the .a and headers were copied into the same flat directory,
causing xcodebuild -create-xcframework to include the .a in Headers/.
Now uses separate lib/ and headers/ subdirectories so the xcframework
slices are properly structured with Info.plist in each slice.