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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.
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Step 3 of the 9P chain (docs/9p.typ 12.3, docs/registry.typ 9P-8). Nothing here
is about 9P: it lands in the FUSE-served tree and any later transport inherits it.
A script could write into a terminal that already existed and read its rendered
scrollback. It could not START one, RESIZE one or SIGNAL one. Two of those were
already effects the core emits, so `exec` and `winsize` are existing
capabilities acquiring a name; only `sig` is new, and it brings the one new
host method, `push_pty_signal`.
pty/ctl winsize <cols> <rows> | sig INT|TERM|HUP|QUIT|KILL | exec
one verb per line, validate-all then apply-all, EINVAL applies
nothing -- `writeCtl`'s shape and `writeCtl`'s reason
pty/status cols, rows, tty-taken as three %11d fields
pty/data write is input to the process; read is the RAW output stream,
gated on a reader count so a pane nobody reads costs one branch
A pane that is not a terminal has no pty/ at all: the lookup is ENOENT and
readdir does not list it.
`PaneFile` is an enum(u4) and this takes it from 11 values to 15. ONE REMAINS.
That is also why pty/ is a DIRECTORY and not three more flat names -- a
subdirectory costs one value and buys its own namespace, so `ctl` and `data`
did not have to be renamed.
Two things the core does not know, and which are therefore not invented: a
child's EXIT STATUS (a shell's death is `Event.eof`, which removes the pane,
so there is no directory left to read it in) and RAW/COOKED (the core never
sets a termios; the mode belongs to the program on the far side).
Verified live against a daemon: pty/ appears only on the terminal pane; a
`winsize 0 24` and a `sig SIGINT` are refused; a bad verb beside a good one
applies neither; `echo pty-works` written to pty/data runs in the shell and its
output reaches the body; and a blocking read of pty/data returns the raw stream,
OSC 133 marks and all. fs-bench unchanged and still zero allocations.
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