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, 4 insertions, 6 deletions

diff --git a/test/snapshots/lookrange.snap b/test/snapshots/lookrange.snap
index 29f88d7f..b64607a1 100644
--- a/test/snapshots/lookrange.snap
+++ b/test/snapshots/lookrange.snap
@@ -48,19 +48,17 @@ stable 700 15000
 snap stale
 snapstyle stale
 # --- and now the first consumer. The look above left r.txt focused, so `/`
-# arms on it: the rows it writes carry the match's span, so n selects a row
-# and the Enter after it goes to that hit with the word itself selected.
+# arms on it: the rows it writes carry the match's span, and the submit goes
+# straight to the first of them — with the word itself selected, which is the
+# whole reason the row spells a range and not a position.
 key /
 text NEEDLE
 key enter
 wait 10000 r.txt:7:4-9 gg NEEDLE
 stable 700 15000
-snap results
-key n
-key enter
-stable 700 15000
 snap hit1
 snapstyle hit1
+# n selects the next row, and the Enter after it goes to that hit
 key n
 key enter
 stable 700 15000