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.

2 files changed, 13 insertions, 13 deletions

diff --git a/test/deck/replay.zig b/test/deck/replay.zig
index 9cf829d6..475f7476 100644
--- a/test/deck/replay.zig
+++ b/test/deck/replay.zig
@@ -1,5 +1,5 @@
 //! Replays slices of real Steam Deck recordings (deckcap .zon captures)
-//! through src/deck.zig and checks the aggregate actions, so the deck
+//! through src/gui/deck.zig and checks the aggregate actions, so the deck
 //! control mapping is exercised without the device.
 
 const std = @import("std");
diff --git a/test/lspbench.zig b/test/lspbench.zig
index 9eddf2f0..ffea0e20 100644
--- a/test/lspbench.zig
+++ b/test/lspbench.zig
@@ -61,17 +61,17 @@ const anchors = [_]Anchor{
     // a call to a function defined in the same file
     .{ .file = "src/pardes.zig", .needle = "modal.hxLineCount(text)", .at = 6, .kind = .definition, .expect = "modal.zig" },
     // a plain local/decl reference within one file
-    .{ .file = "src/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .definition, .expect = "lsp.zig" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .definition, .expect = "lsp.zig" },
     // a std reference: needs the zig lib dir, which is the first thing a
     // single-file backend cannot do
-    .{ .file = "src/lsp.zig", .needle = "std.mem.count(u8", .at = 8, .kind = .definition, .expect = "mem.zig" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "std.mem.count(u8", .at = 8, .kind = .definition, .expect = "mem.zig" },
     // hover over the same symbol
-    .{ .file = "src/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .hover, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .hover, .expect = "" },
     // the file's own symbols
-    .{ .file = "src/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .document_symbols, .expect = "Kind" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .document_symbols, .expect = "Kind" },
     .{ .file = "src/modal.zig", .needle = "pub fn ", .at = 7, .kind = .document_symbols, .expect = "" },
     // references to a symbol used in several places
-    .{ .file = "src/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .references, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .references, .expect = "" },
     // Diagnostics and format probe a DELIBERATELY BROKEN fixture, never the
     // real source. On a clean corpus the correct answer is nothing, which is
     // byte-identical to "this backend has no diagnostics" — a blind spot that
@@ -80,16 +80,16 @@ const anchors = [_]Anchor{
     // and a misformatted fn (needs a formatter), so both probes have real work.
     .{ .file = "test/lspfixture/broken.zig", .needle = "unused_local", .at = 0, .kind = .diagnostics, .expect = "broken.zig" },
     // the remaining kinds, probed once each so the matrix is complete
-    .{ .file = "src/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .declaration, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "lineCol(source", .at = 0, .kind = .declaration, .expect = "" },
     // cursor on `out`, whose type is `*std.Io.Writer` — a type_definition probe
     // wants a NAME whose type must be resolved, not the type spelled out
-    .{ .file = "src/lsp.zig", .needle = "out: *std.Io.Writer", .at = 0, .kind = .type_definition, .expect = "" },
-    .{ .file = "src/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .implementation, .expect = "" },
-    .{ .file = "src/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .select_refs, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "out: *std.Io.Writer", .at = 0, .kind = .type_definition, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .implementation, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .select_refs, .expect = "" },
     .{ .file = "test/lspfixture/broken.zig", .needle = "badly_spaced", .at = 0, .kind = .format, .expect = "" },
-    .{ .file = "src/lsp.zig", .needle = "pub fn query", .at = 7, .kind = .code_action, .expect = "" },
-    .{ .file = "src/lsp.zig", .needle = "pub fn query", .at = 7, .kind = .rename, .expect = "" },
-    .{ .file = "src/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .workspace_symbols, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub fn query", .at = 7, .kind = .code_action, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub fn query", .at = 7, .kind = .rename, .expect = "" },
+    .{ .file = "src/lsp/lsp.zig", .needle = "pub const Kind", .at = 11, .kind = .workspace_symbols, .expect = "" },
     .{ .file = "test/lspfixture/broken.zig", .needle = "unused_local", .at = 0, .kind = .workspace_diagnostics, .expect = "broken.zig" },
 };