Overall `just test` runs about 10-20s faster on this branch than current main, for me, with around 170s instead of around 180-190s. But the cool thing is the compile time. Making a simple edit to any file involved and running `just test` on main takes about 60s to recompile the test binaries. On this branch it takes less than 15s. This is done by replacing a ton of separate test binaries with a single megabinary. Only test files that looked safe have been included, avoiding ones that do stuff like setting env.