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, 14 insertions, 0 deletions

diff --git a/test/snapshots/msg.snap b/test/snapshots/msg.snap
index 640e9a0c..d1371dab 100644
--- a/test/snapshots/msg.snap
+++ b/test/snapshots/msg.snap
@@ -75,3 +75,17 @@ key esc
 settle 100
 stable 700 15000
 snap esc
+# Every other writer of this row is something going WRONG, which is a poor way
+# to look at a row: `Msg <text>` is the word that writes it on purpose. An
+# ordinary builtin, so it runs the ordinary way — write it in the buffer,
+# select the line, execute it — and what lands is the text, verbatim, with the
+# same stamped-looking left edge as the reports above. (The clock belongs to
+# the SHELL, which is why this one has none: the core has no clock.)
+key o
+text Msg hand-written report
+key esc
+settle 100
+key x
+key tab
+stable 700 15000
+snap msgbuiltin