* fix(domain): admit Qualcomm Hexagon (EM_HEXAGON, 164) ELF binaries
Resolve missing ELF admission case for Qualcomm Hexagon DSP targets (e_machine = 164, EM_HEXAGON).
- Add 'hexagon' to BINARY_ARCHITECTURES and HeaderArchitecture
- Map EM_HEXAGON (164) in elfArchitecture() to 'hexagon'
- Include 'hexagon' in GhidraProvider's SUPPORTED_ARCHITECTURES
- Gracefully decline 'hexagon' with Ghidra-directed diagnostic in Hopper and IDA
- Add unit tests for Hexagon ELF parsing and adapter admission checks
Fixes#4781
* fix(hopper,ghidra): add Ghidra guidance to Hopper Hexagon refusal and add Ghidra admission regression test