Add a gdb stub and an arm jit so that we can debug clvm in gdb.

[prozacchiwawa]

Note

High Risk
Introduces a large new ARM JIT/ELF/DWARF generation and GDB remote-stub execution path, plus new external deps and CI requirements; bugs here could affect correctness of debug output and test stability.

Overview
Adds a new ARM-based JIT debugging pipeline that can compile CLVM/Chialisp into an ARM ELF with DWARF line info, execute it in an embedded ARMv4T emulator, and expose execution via a gdbstub remote server (new compiler::debug::armjit module).

Introduces a new armtx CLI for generating the ELF and launching the emulator/stub, plus GDB helper scripts/tests and CI updates to install gdb-multiarch so the new debug smoke tests run in GitHub Actions.

Updates core compiler plumbing to support this path (exports apply_op for emulator-side operator execution) and adds several new dependencies (gimli, faerie, elf_rs, armv4t_emu, gdbstub, subprocess, etc.), with corresponding lockfile changes.

^{Reviewed by Cursor Bugbot for commit 1232a68. Bugbot is set up for automated code reviews on this repo. Configure here.}