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(This firmware seems inactive, but I'm putting this here for posterity and visibility.)
In preparation for future hacking, I've managed to update the toolchain (gcc 14.2), core library (libopencm3), and GitHub Actions CI workflow.
I had to make a few fixes to please the compiler (missing includes, lib API changes) and I disabled the post-process build step that generates a ".map" file due to a linker error. There are still some linker warnings... hopefully they aren't serious! I haven't tested the Simulator platforms at all, but they build successfully. The 4.0 series of emsdk broke the WASM build, so I held that one back to 3.1.74.
The CI workflow will produce an artifact file with the hardware binaries for every run, making it easier to build and test if you don't have a local toolchain set up (e.g. on Windows).