shaders: -Dprebuilt-shaders, so a gui build needs no Vulkan SDK

glslc is the one build input that wants a tool a stock machine does not have,
and it is also the input that changes least often: eight GLSL files that have
outlived several rewrites of everything around them. Asking every machine that
wants to run the SDL shell for shaderc is the wrong trade.

The SPIR-V is now COMMITTED, under shaders/prebuilt/, and -Dprebuilt-shaders
embeds that copy instead of shelling out. The default stays the honest one --
compile the shaders that are actually in the tree -- because the flag trades a
dependency for a freshness problem: with it on, the .glsl sources are not build
inputs at all, so editing one changes nothing.

`zig build shaders` is the other half, and it is deliberately independent of
-Dplatform: it recompiles every shader and writes the result back into the
tracked directory, so whoever changes a shader refreshes the cache on a machine
that has the compiler and commits the diff. `jj diff shaders/prebuilt` after it
is the freshness check -- empty means the cache was already current.

The shader list is also spelled once now (gui_shaders): the eight embeds, the
eight glslc runs and the refresh step all read it, so adding a shader is a name
there plus the @embedFile in gui.zig, not three edits in two places.

Verified: -Dplatform=gui -Dprebuilt-shaders builds with glslc absent from PATH,
and image-harness passes on that binary -- real SDL GPU pipelines built from the
committed SPIR-V, 512 source pixels read back. The default gui build still runs
the eight glslc steps; tty runs none. The committed bytes are identical to a
fresh glslc run, and `zig build shaders` is idempotent.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/config.zig b/src/config.zig
index 107eb1a7..de971db9 100644
--- a/src/config.zig
+++ b/src/config.zig
@@ -136,6 +136,11 @@ pub const leader_path = paths: {
         .Newcol = "cn",
         .Delcol = "cd",
         .Debug = "td",
+        // `Msg` takes the text to post, so it has no path, for the reason
+        // `Theme` and the two acme verbs below have none: a key path names a
+        // builtin and can never carry an argument. Bare `Msg` still runs — it
+        // reports itself through the error path.
+        .Msg = null,
         .Colors = "tc",
         .Wrap = "tw",
         .Tagbottom = "tb",