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The tty shell rendered (core.render + full vaxis repaint + tree-sitter
re-highlight of the visible window) after EVERY event, so a wheel flick over a
highlighted file was 150 re-parses and 150 terminal repaints; the gui shell
drains the SDL queue before drawing and never had the issue. Now the tty loop
applies every queued input event, then renders once (batch cap 64; pty output
keeps a frame per chunk so progress paints and transient-state waits behave
exactly as before). Measured with tracy on a 2400-line .zig scroll script:
150 highlightFileRange calls at 1.85ms mean -> 4; render pipeline total
730ms -> 64ms; 364 frames -> 39. Snap suite 18/18.
Tracy: -Dtracy=<path-to-tracy-checkout> compiles TracyClient.cpp into the
binary and turns src/tracy.zig zones live (default off, all no-ops). Sampling,
callstacks, system tracing and the crash handler are disabled: tracy's symbol
worker SIGSEGVs on this binary's debug info and its crash handler then parks
every thread before the first frame. Capture: tracy-capture -o t.tracy; export:
tracy-csvexport t.tracy.
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