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a74e352726
This commit adds a few new mode flags to the `bench-stream` program to generator synthetic OSC sequences. The new modes are `gen-osc`, `gen-osc-valid`, and `gen-osc-invalid`. The `gen-osc` mode generates equal parts valid and invalid OSC sequences, while the suffixed variants are for generating only valid or invalid sequences, respectively. This commit also fixes our build system to actually be able to build the benchmarks. It turns out we were just rebuilding the main Ghostty binary for `-Demit-bench`. And, our benchmarks didn't run under Zig 0.14, which is now fixed. An important new design I'm working towards in this commit is to split out synthetic data generation to a dedicated package in `src/bench/synth` although I'm tempted to move it to `src/synth` since it may be useful outside of benchmarks. The synth package is a work-in-progress, but it contains a hint of what's to come. I ultimately want to able to generate all kinds of synthetic data with a lot of knobs to control dimensionality (e.g. in the case of OSC sequences: valid/invalid, length, operation types, etc.).