Refactor panes and filesystem; replace FUSE with 9P

Consolidate pane, layout, memory and host code. Serve 9P by default over Unix sockets, with runtime mounts and optional TCP/QUIC transports. Remove FUSE and obsolete proof-of-concept examples.

Fix highlighting and terminal-history performance, expand differential and stress-test infrastructure, sort navigation results while preserving the next occurrence, add syntax-colored Braille minimaps, remove SPC-k, and document 9P interaction as a repository skill.

1 files changed, 3 insertions, 9 deletions

diff --git a/test/e2e_harness.zig b/test/e2e_harness.zig
index e08e59f2..f7f380df 100644
--- a/test/e2e_harness.zig
+++ b/test/e2e_harness.zig
@@ -14,7 +14,7 @@ extern "c" fn forkpty(
 ) c_int;
 extern "c" fn execvp(file: [*:0]const u8, argv: [*:null]const ?[*:0]const u8) c_int;
 extern "c" fn _exit(status: c_int) noreturn;
-extern "c" fn setenv(name: [*:0]const u8, value: [*:0]const u8, overwrite: c_int) c_int;
+extern "c" fn unsetenv(name: [*:0]const u8) c_int;
 
 /// Monotonic milliseconds; the harness's only clock (std.time lost
 /// milliTimestamp in 0.16).
@@ -88,18 +88,12 @@ pub const Harness = struct {
         argv[0] = exe;
         for (args, 0..) |a, i| argv[i + 1] = a;
 
-        // The app under test is a fresh outer session even when this harness
-        // itself is running in a pardes pane. Unlike --nested, the boundary
-        // still lets pane shells below that app detect and talk to it, which
-        // nested.snap exercises directly.
-        var boundary_buf: [32:0]u8 = undefined;
-        const boundary = try std.fmt.bufPrintSentinel(&boundary_buf, "{d}", .{@as(u32, @intCast(libc.getpid()))}, 0);
-        if (setenv("PARDES_NESTED_BOUNDARY_PID", boundary, 1) != 0) return error.SetEnvFailed;
-
         var master: c_int = undefined;
         const ws = posix.winsize{ .row = rows, .col = cols, .xpixel = 0, .ypixel = 0 };
         const pid = forkpty(&master, null, null, &ws);
         if (pid == 0) {
+            for ([_][*:0]const u8{ "PARDES_9P", "PARDES_PANE", "PARDES_FORWARD_LOOK" }) |name|
+                if (unsetenv(name) != 0) _exit(126);
             _ = execvp(exe, argv.ptr);
             _exit(127);
         }