Flatten the 9P control tree and move it out of fs.zig

The served tree loses the self/ level: /index /ctl /new /log /screen
/listeners /pane/<n>/... /os, with /src only in -Dembed-sources=true builds
(default off, on for esp32p4). ctl speaks the editor's own language with two
lowercase verbs, look TEXT and exec TEXT, plus acme's addr verbs; the new/
factory directory becomes one clone file; cons is gone (exec Msg); name and
sel are files; stats report real lengths, modes and mtimes; /log streams
pane new/del/rename/save events. The tree code lives in src/ninep/
(tree, pane, ctl, addr, pty, events, screen, sources); fs.zig keeps host
access, mounts, resolution and find/grep. Same engine and transports.
README (fs-help.txt) and docs rewritten; tests updated and extended.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/test/snapshot.zig b/test/snapshot.zig
index a7a1ba48..7fa84a86 100644
--- a/test/snapshot.zig
+++ b/test/snapshot.zig
@@ -1151,7 +1151,7 @@ const Screen9p = struct {
 fn snap9p(arena: std.mem.Allocator, h: *eh.Harness, label: []const u8, prev: *Prev) ![]u8 {
     var dial_buf: [24]u8 = undefined;
     const dial = try std.fmt.bufPrint(&dial_buf, "{d}", .{h.pid});
-    const bytes = try Client.read(gpa, dial, "/self/screen", "/self/screen");
+    const bytes = try Client.read(gpa, dial, "/screen", "/screen");
     defer gpa.free(bytes);
     const parsed = try std.json.parseFromSlice(Screen9p, gpa, bytes, .{});
     defer parsed.deinit();