structure: backends into src/{tty,gui,lsp}, pane kinds and builtins into their own files

The core now lies FLAT at src/ and every subdirectory is one backend, so a
file being in no directory at all is what says it is core. Pane-kind bodies
leave pardes.zig for term_pane.zig / file_pane.zig / output_pane.zig, leaving
it the layout, the event/effect machine and the generic render loop.

Builtins are one struct each in builtins.zig, and the enum is folded out of
the file's own declaration list at comptime — a zig file IS a struct, so the
list of builtins and the builtins themselves are the same text. Adding one is
writing a struct. Key paths deliberately stay one table for the config pass.

Pure refactor: no golden moved.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/main.zig b/src/main.zig
index 61c0049e..436cf938 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -100,7 +100,7 @@ fn emscriptenMain(argc: c_int, argv: [*]?[*:0]u8) callconv(.c) c_int {
 
 // no argv in the browser: options stay default, state comes from the dump
 fn webMain() !void {
-    try @import("gui.zig").run(.{});
+    try @import("gui/gui.zig").run(.{});
 }
 
 fn nativeMain(init: std.process.Init) !void {
@@ -153,8 +153,8 @@ fn nativeMain(init: std.process.Init) !void {
         }
     }
     switch (pardes.platform) {
-        .tty => try @import("tty.zig").run(init, opts),
-        .gui => try @import("gui.zig").run(init, opts),
+        .tty => try @import("tty/tty.zig").run(init, opts),
+        .gui => try @import("gui/gui.zig").run(init, opts),
         .web => unreachable, // web enters through webMain, never here
     }
 }