Move saving and loading a whole editor out of pardes.zig into dump.zig

Pure move, no behaviour change (acme keeps dump and load in rows.c):
dumpState, restore, initFromDump and initDump go verbatim to the end of
dump.zig, after the dump format they read and write. Inside dump.zig the
moved code's `dump.` prefix drops, so `Pane` there is the dump record; the
one editor pane it names is spelled `pardes.panes.Pane`, and its other
`panes.X` references become `pardes.panes.X` because dump.zig's own tests
use `panes` as a local name.

The methods become free functions taking `p: *Pardes`: `p.dumpState()`
becomes `dump.dumpState(p)`, `core.restore(bytes)` becomes
`dump.restore(core, bytes)` and `Pardes.initFromDump(..)` becomes
`dump.initFromDump(..)`, in pardes.zig, the shells, layout.zig,
Terminal.zig, builtins.zig and the tests (38 receiver rewrites plus the
initFromDump calls). The tag-tail restore helpers stay with the tag code.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/macos.zig b/src/macos.zig
index f83fb8b4..78356810 100644
--- a/src/macos.zig
+++ b/src/macos.zig
@@ -6,6 +6,7 @@ const builtin = @import("builtin");
 const posix = std.posix;
 const libc = std.c;
 const pardes = @import("pardes.zig");
+const dump = @import("dump.zig");
 const mouse = @import("mouse.zig");
 const colors = @import("colors.zig");
 const look = @import("look.zig");
@@ -1344,7 +1345,7 @@ fn restoreCore(st: *State) bool {
         return false;
     };
     defer st.gpa.free(bytes);
-    const replacement = st.core.restore(bytes) catch |err| {
+    const replacement = dump.restore(st.core, bytes) catch |err| {
         st.core.reportError(st.core.active, "Restore", err);
         return false;
     };
@@ -1411,7 +1412,7 @@ test "mac Restore keeps host state and rejects callbacks from the old core" {
     const old_serial = core.panes[0].?.serial;
     st.gens[0] = 23;
     const old_watch = try st.file_watches.replace(gpa, 0, "/test.txt", old_serial, .{ .text = 0 });
-    try core.dumpState();
+    try dump.dumpState(core);
     try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "restore.zon", .data = core.dump_out.? });
     while (core.nextEffect()) |_| {}
 
@@ -1501,7 +1502,7 @@ test "mac Restore cancels a PTY reader waiting for output capacity" {
     defer st.config_arena.deinit();
     defer st.file_watches.deinit(gpa);
     defer st.inbox.close(gpa, io);
-    try st.core.dumpState();
+    try dump.dumpState(st.core);
     try tmp.dir.writeFile(io, .{ .sub_path = "restore.zon", .data = st.core.dump_out.? });
     while (st.core.nextEffect()) |_| {}
     for (0..inbox_output_limit) |_| try st.inbox.pushOutput(gpa, io, .{