Add module READMEs, .gitignore, and remove Bin/ from tracking

Add README.md for each library module documenting API, platform
backends, and usage. Add .gitignore for build artifacts. Remove
pre-built binaries from version control.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

libsst-glapi/README.md

@@ -0,0 +1,40 @@
+# libsst-glapi
+
+Thread-safe OpenGL 3.3 function loader with per-thread context management.
+
+## Usage
+
+```c
+#include <SST/SST_GLAPI.h>
+
+SST_GLAPI_InitForThread(NULL);  // NULL = platform default library
+
+// Standard GL calls work via macros:
+glClear(GL_COLOR_BUFFER_BIT);
+glDrawArrays(GL_TRIANGLES, 0, 3);
+
+SST_GLAPI_ShutdownForThread();
+```
+
+The macros in `SST_GLAPIMacros.h` dispatch through a thread-local
+`SST_GLAPI` struct containing 334 function pointers.
+
+## API
+
+- `SST_GLAPI_InitForThread(libName)` -- load GL library, resolve all symbols
+- `SST_GLAPI_ShutdownForThread()` -- release resources
+- `SST_GLAPI_GetThreadGLAPI()` -- get current thread's function table
+- `SST_GLAPI_CopyForThread(api)` -- install a custom function table
+
+## Platform backends
+
+| Platform | Library | Symbol resolution |
+|---|---|---|
+| Windows | opengl32.dll | `wglGetProcAddress` + `GetProcAddress` |
+| Linux/POSIX | libGL.so.1 | `glXGetProcAddressARB` |
+| macOS | OpenGL.framework | `dlsym` |
+
+## Code generation
+
+`parsegl.c` reads `gl33.txt` and generates `SST_GLAPIStruct.h`,
+`SST_GLAPIStruct.c`, and `SST_GLAPIMacros.h`.