Adding a New Architecture

1. Add an Architecture entry to tools/registry.py
2. Add the architecture to each supported OperatingSystem.architectures list
3. Add syscall numbers to the relevant SYSCALL_NUMBERS tables
4. Create src/include/picblobs/syscall/{arch}.h with the inline asm primitive
5. Create the matching runner _start stubs under tests/runners/*/start/ for every runner type that will execute the architecture
6. Pin the Bootlin SHA256 on the Architecture entry in tools/registry.py
7. Run python tools/generate.py
8. Run python -m pytest python/tests/test_sync.py -v (catches anything missed)
9. Build, stage, verify: bash python tools/stage_blobs.py --configs linux:{arch} picblobs-cli verify --os linux --arch {arch}