Update fastga-rs to 15ba3ec (FastGA 37fe187 + wrapper files)

Updates fastga-rs dependency to latest version which includes:
- FastGA updated to commit 37fe187a67f74240a45c9889bfb54ef8fadd2436
- Restored Rust FFI wrapper files (rust_wrappers.c, rust_onelib.c)
- Various improvements to align.c, ONElib, and build system

Note: This requires the wrapper files commit in the FastGA submodule
to be available. For local development, use:
  fastga-rs = { path = "/path/to/fastga-rs" }
in Cargo.toml if network issues occur.

Author: ekg

Cargo.lock

@@ -11,7 +11,7 @@ rayon = "1.10"
 byteorder = "1.5"
 tempfile = "3.8"
 ordered-float = "4.0"
-fastga-rs = { git = "https://github.com/pangenome/fastga-rs.git", rev = "932fc00" }
+fastga-rs = { git = "https://github.com/pangenome/fastga-rs.git", rev = "15ba3ec" }
 chrono = "0.4"
 flate2 = "1.0"
 libc = "0.2"