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A keystroke on the ESP32-P4 cost 17.0 ms and the goal is 4. Profiling the core in
that board's exact configuration - 40x12, tree-sitter disabled, via `zig build perf
-Dtree-sitter=disabled -- --cols 40 --rows 12 --only small` - named the cost, and it
was Unicode machinery answering questions about the letter `y`.
Four changes, each a fast path guarded so that non-ASCII text takes exactly the road
it took before.
`modal.graphemeStart` was 21.5% of a keystroke, the single largest item. It iterates
graphemes FROM THE START of the text with the full UAX #29 break state machine until
it passes the offset, and the render path calls it once per visible row with a column
offset - so the cost followed the cursor's distance along its line. That is the shape
measured on the die, where inserting at column 320 of a fixed 320-character line cost
7.8 ms more than inserting at column 0 of the same line. In UAX #29 every ASCII
scalar is its own cluster with ONE exception, GB3 (CR joined to LF); every other rule
that could extend a cluster - Extend, ZWJ, SpacingMark, Prepend, Regional_Indicator -
is spelled with non-ASCII scalars. So an ASCII byte whose predecessor is also ASCII,
and not that CR-LF pair, IS a boundary. O(1), and sound rather than approximate.
`Surface.print` then became the largest at 26.2%: per character it took a UTF-8
length, a decode, a FRESHLY CONSTRUCTED grapheme iterator, a slice validation and a
width lookup, to conclude that `y` is one cell. Printable ASCII followed by ASCII
takes none of that now. Same guard, same reason.
`file_pane.graphemeDisplayWidth` was 6.9%, essentially all of it asking `gwidth`
about ASCII. Bounded to 0x20..0x7e on purpose: DEL and the C0 controls are not one
printable cell and `gwidth` stays the authority on them.
`modal.lineSlice` searched for "\n" with the generic substring search where a memchr
does; it is called once per visible row per frame.
Measured at the P4's geometry and configuration, on the host: render 55 -> 12 us,
key-down 483 -> 24 us, key-right 327 -> 13 us, edit-char 205 -> 46 us. On the die,
the per-character cost of a keystroke fell from 54.3 to 6.9 us - 7.9x - and a
keystroke at a 160-character line from 25.56 ms to 15.36 ms.
## The shadow grid, and why it is static
`src/p4.zig`'s `present` copied all 480 cells into vaxis every frame, which measured
6.75 ms on the die - 57% of a keystroke - and was paid whether or not anything
changed: a second render with nothing new cost the same as the first. vaxis diffs its
own grid, but only after being told every cell, and being told is the expensive part.
So `present` now keeps the previous Surface and tells vaxis only what moved.
`Cell.visuallyEqual` is the right comparison and already existed. Copy: 6.75 -> 1.45 ms.
The grid lives in `.bss`, sized by `max_cols` x `max_rows` at comptime, and that is
not a micro-optimisation. The first version allocated it from the editor's heap; on a
board whose 384 KiB is nearly spoken for, that is exactly the kind of change that
works and then breaks something else three steps away.
`shadow_grid` is a comptime A/B switch, kept deliberately. With it false, `present`
behaves as it did before - clear and write every cell - which is the reference any
measurement should be compared against, and the way to tell a rendering bug from a
rendering difference. It earned its keep immediately: the two paths were run against
the same 19-step workload on the die - inserts, deletes, motions that move the
modified-marker, a line outgrowing the viewport, backspaces that shrink it - and the
reconstructed screens are byte-identical.
## Verification
`snap` 95/95 scripts, `hxdiff` 481 cases 0 mismatches, `hxparity` 561 cases 0
mismatches, `unit-test`, `image-harness`, `pdf-harness`, `mupdf-check`, and tty / p4 /
gui all build. The rendering changes are exactly the sort that pass a latency
benchmark while corrupting a screen, so the snapshot parity suite is the one that
matters here and it is unchanged.
`test/perf.zig` gains `--cols`/`--rows`/`--only`. The screen's shape is one of the
things that table exists to hold constant, and 40x12 is not a scaled guess at the
board - it is the board. `--only` exists because under `perf record` one 63 ms cell on
the largest fixture swamps every sample from the case being asked about.
## Found, not fixed
`vx.resize` fails on this board: a runtime geometry change hits its allocation
failure path, restores the previous size and returns, so 80 bytes go out where 1,392
should. Verified independent of everything above - it reproduces with `shadow_grid`
false. The board therefore has one geometry for the life of a session, which is why
the staleness test above compares two firmwares rather than resizing one.
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`-Dplatform=p4 -Dtarget=riscv32-freestanding` emits a single freestanding OBJECT
exporting a seven-function C ABI, not an executable. The board's toolchain
(../05-zig-p4) owns `_start`, the linker script and the UART driver and links this
in. The seam is bytes rather than types, so neither side can accidentally depend
on the other's internals, and a signature that drifts fails at link time.
The serial line is the whole of the I/O. `src/p4.zig` drives vaxis unchanged over
it: the renderer is a byte writer and `queryTerminalSend` is a byte writer, so the
terminal emulator on the host answers the capability handshake and the firmware
sees a real terminal. Measured going out over the wire on attach: alt screen,
in-band resize, cursor report, kitty keyboard, kitty graphics, DA1.
THREE WORDS EXIST ONLY HERE. `src/board_memory.zig` implements `Peek`, `Poke` and
`Hexdump`, gated on `builtin.os.tag == .freestanding and !isWasm()` - derived from
the TARGET, because they are a property of running with no OS under you rather
than a product option, and because wasm is freestanding too and is exactly what
must be excluded: in a browser an address is an offset into the linear memory this
editor's own heap lives in. Every access goes through `*allowzero volatile`: a
peripheral register is not memory, and address 0 is an ordinary unmapped address
on this bus. One 4 KiB cap per command, set by the console rather than the memory -
an unbounded dump would wedge the only console the board has for eleven hours.
Measured on ESP32-P4 rev v1.3 silicon, driven from a host terminal:
Peek 0x501101a4 0x0e63ce71, then 0xaeaa6919 on a second read - the
RNG register, so the volatile loads are not folded
Poke 0x5011002c 0xdeadbeef LP_STORE0; a later Peek returned 0xdeadbeef
Hexdump 0x5011002c 32 16 bytes a row, hex columns and an ASCII gutter
Peek 0x50110001 `peek: MisalignedAddress` on the message row
That last line is the one that matters. A misaligned 32-bit access traps, and a
trap in firmware is a watchdog reset that takes the session with it, so the check
that turns it into a message is the reason the file is hand-written rather than a
generic reader.
BARE METAL BOOTS AN EMPTY OUTPUT BUFFER. Every other boot layout in `init` makes a
shell, and on this platform that is not a preference but an impossibility: nothing
to fork, no pty to give a terminal pane. Booting one anyway produced precisely what
that describes - a pane whose tag ends in `Filter`, no gutter, no buffer, and every
keystroke vanishing into the Fallback's silent pty. An output buffer is also what
the platform's own words want, since Peek, Poke and Hexdump each fill one.
Sized for the board rather than for a desktop:
* `allocators.zig` gains a p4 tier that is ALL fallback - every capacity is zero,
so each arena spills immediately to the 384 KiB heap the firmware hands over,
and no megabyte-shaped static reservation lands in `.bss`.
* `source_manifest.zig`'s allowlist is EMPTY on p4. The table is ~0.95 MiB of
rodata against a 1.5 MiB flash partition; the firmware's filesystem is the
serial host's, through the Host vtable.
* The grid is clamped and the clamp is measured, not guessed: every cell is paid
for four times (vaxis Screen + InternalScreen, pardes Surface + previous_cells),
so 40x12 fits and 80x24 exhausts the heap during `Pardes.init`.
* `Vaxis.resize` deinits both screens before allocating replacements, so a failed
resize leaves vaxis rendering nothing. The p4 shell keeps the previous geometry
on failure instead of leaving a half-applied one.
Also here: `output_pane_integration_test.zig` had an exhaustive switch over
`Platform` that adding `.p4` left unhandled, which broke `zig build unit-test`
outright - the native test binary is the one consumer no platform build compiles.
346 tests pass again.
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takes a path argument
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walk wrapped rows
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optional methods
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backends agree
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docs
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additions, unit tests
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over grid cells
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+ snapshot refresh
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snapshots
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glslc is the one build input that wants a tool a stock machine does not have,
and it is also the input that changes least often: eight GLSL files that have
outlived several rewrites of everything around them. Asking every machine that
wants to run the SDL shell for shaderc is the wrong trade.
The SPIR-V is now COMMITTED, under shaders/prebuilt/, and -Dprebuilt-shaders
embeds that copy instead of shelling out. The default stays the honest one --
compile the shaders that are actually in the tree -- because the flag trades a
dependency for a freshness problem: with it on, the .glsl sources are not build
inputs at all, so editing one changes nothing.
`zig build shaders` is the other half, and it is deliberately independent of
-Dplatform: it recompiles every shader and writes the result back into the
tracked directory, so whoever changes a shader refreshes the cache on a machine
that has the compiler and commits the diff. `jj diff shaders/prebuilt` after it
is the freshness check -- empty means the cache was already current.
The shader list is also spelled once now (gui_shaders): the eight embeds, the
eight glslc runs and the refresh step all read it, so adding a shader is a name
there plus the @embedFile in gui.zig, not three edits in two places.
Verified: -Dplatform=gui -Dprebuilt-shaders builds with glslc absent from PATH,
and image-harness passes on that binary -- real SDL GPU pipelines built from the
committed SPIR-V, 512 source pixels read back. The default gui build still runs
the eight glslc steps; tty runs none. The committed bytes are identical to a
fresh glslc run, and `zig build shaders` is idempotent.
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The documentation had gone stale in the ordinary way -- claims that were true
when they were written and that nothing since had been obliged to re-read.
Some of them were load-bearing.
THE TUTOR. It still said there is no multi-cursor, that NextColor cycles three
themes, and that its practice blocks "are also run as unit tests (generated
from this file by tutor_gen)" -- a tool that appears nowhere in the tree, and
nothing anywhere parses a `# keys:` block. Left alone, that claim is what
makes the next wrong block survive.
Three of those blocks WERE wrong, and all three for one reason: since the
helix motion model landed, w/e/f/t SELECT the range they cross, so `i` after
one inserts at the SELECTION'S START. `w i Z esc` on "foo bar" gives
"Zfoo bar", not the "foo Zbar" the file promised. They were written against a
vim reading of the same keys. Every block in the file has now been run through
`zig build hxdiff` against the real core and matches byte for byte, and the
trap itself is written down in 3.3 rather than left to be rediscovered.
The tutor gains a PART 4 for everything added since it was written -- PDF
panes, the in-process ZLS backend, themes and fonts, the startup file -- and
PART 3 gains counts (and which keys ignore one), f/F/t/T, the whole g table
(bare `G` is a no-op; `ge` is the START of the last line), multiple cursors
and the s/S regex pair, `m`, `]`/`[`, `|`, insert mode, and all fifty leader
paths.
THE REST. design.typ's line table claimed 7,626 lines against a real 38,048,
and its rows did not sum to its own total; its Event/Effect boundary contract
-- the part a shell author writes against -- named four variants that do not
exist and omitted fourteen that do. lsp.md's probe count. config.md's
theme-name rules, which as written could not reach a zed theme at all.
helix-keys.md's Skipped section, holding five families that have since landed.
macos.md's menu bar, undocumented, along with sixteen other claims. web.md on
what the browser build can actually do.
SOURCE COMMENTS that had rotted alongside them: `tag_normal` is a space, not
the `•` its own comment describes; Wrap is ON by default, not off; a FontSel
row is SELECTED by n and RUN by Tab, not run by n; the SPC paths in lsp.zig
lost their `l` group prefix when the language group moved; and the
differential suites are 481 and 561 cases, not 360 and 440.
TWO THINGS FOUND BY DOCUMENTING THEM, both left standing and written down
rather than papered over. Typing `[^\n]` at an s/S prompt panics: the live
preview compiles every prefix, and `[^\` indexes an empty slice in mvzr's
parseCharSet. Both the tutor and a waiver recommended that pattern as the
workaround for `.` matching a newline; they now say what it costs and what
would make it sayable. And `Exec` is a builtin, so an `Exec` line in the
startup config types that command into a shell before the first frame -- the
tutor said nothing in that file is ever sent to one.
Nine adversarial reviews over two rounds, each with the hxdiff harness to
execute what it doubted. The second round exists because the first round's
fixes needed checking too, and it caught three regressions of my own -- one of
them a probe count I had "corrected" away from the truth.
Verified: unit-test, snap 87/87, hxdiff 481/0, hxparity 561/0, mupdf-check.
docs/design.pdf regenerated. The tutor's first seventeen lines are byte-
identical, which is what tutor.golden pins.
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Three changes that all turned out to be the same shape -- a feature that
worked in one direction, or for one pane kind, and quietly did not in the
others.
CLIPBOARD. Every register write emitted set_clipboard, so deleting one
character threw away whatever the desktop was holding; multi-cursor yank took
the join's early return and emitted nothing at all, so the same key reached
the clipboard on one cursor and not on two. Nothing could READ the clipboard:
the SDL shell had no SDL_GetClipboardText anywhere in it, and the tty shell
never asked for OSC 52, so `p` from another application was dead in both.
Now it is helix's split. y/d/c/p/P/R and the acme chords are the DEFAULT
REGISTER and nothing else; the system clipboard is five words on helix's own
letters -- SPC y, SPC Y, SPC p, SPC P, SPC R -- spelled as builtins so they
land in Help and are executable like every other verb. The one exception is
the tag `y` chord, which still mirrors out because a tag is always insert, so
SPC cannot be pressed there, and copying the path out is the whole point of
the chord.
Reading is a new read_clipboard effect answered by an ordinary Event.paste, so
the round trip is honest about being one: SDL and NSPasteboard answer inside
the same drain, the browser answers a promise, and a terminal answers over
OSC 52 or -- far more often -- refuses. A refused read is a paste that does
not happen, and the request dies at the next keystroke rather than landing
minutes late in whatever pane is focused by then.
The tty shell also enables BRACKETED PASTE now and coalesces
paste_start..paste_end into one event. Before this a paste arrived as a flood
of individual key presses: plausible in insert mode, and in normal mode every
pasted character ran as a command.
n/N. They stepped the armed results buffer and immediately Looked each row, so
you could not walk past a hit without opening it. They are a MOTION now:
select the next look-able text, open nothing, and let Enter decide. What they
step is the largest whitespace-delimited run look.resolve can act on
(look.lookableSpan, wrapper punctuation peeled), over a RING of panes -- every
pane that has performed a look, most recent first, then the output buffers
that have not, newest first, and only if both are empty the pane in front of
you. N is the exact inverse of n, computed rather than remembered: both
directions ask the same question about the same spans and compare against the
column the walk parks on, so x presses one way and x back land exactly where
you started, pane boundaries and the ring's seam included.
A ring rather than a list with two ends because a shell's cursor sits at the
prompt, below everything it has printed, so a walk that could not come round
would have nowhere to go on the very first press -- which is the case n/N were
written for.
One motion everywhere, no pane-kind or buffer-kind special case. The only
thing a buffer may change is the GRAIN of what a step selects, and it does it
with one flag rather than a branch: output_pane.Traits.commands (renamed from
`executes`, which named one reader's behaviour rather than the fact) makes a
row select WHOLE, because a ThemeSel line is a word to run and has no path
inside it to pick out. `]d`/`[d` are not n/N -- they are helix's diagnostic
motions, their job is to ARRIVE, and they still reach searchStep.
THE TTY PROMPT. Leaving raw tty blanked the prompt row, and the command you
had typed at that prompt shares the row, so it went too -- a shell out of tty
read as output only. OSC 133 marks the row CELL by cell, so the two are
separable: config.tty_blank = .prompt cuts the prompt's own columns and leaves
the command, left-hugged at column 0 in line with the output under it rather
than in a bay of blanks. .prompt_and_input is the old behaviour, kept.
Because the row is now something you can put a cursor in, enterTty adds the
hidden prompt width back before asking ghostty to walk the shell's own cursor
to it -- the modal column on a cut row is short by exactly that much.
Verified: unit-test 186/186 (nine new), snap 87/87 (new ttyprompt.snap),
hxdiff 481 and hxparity 561 with 0 mismatches, tty and gui both build. And
against the real binaries rather than the harness: in a pty, SPC y emits OSC
52 carrying exactly the selection while plain y emits nothing, SPC p issues
the read and pastes the reply, and a bracketed paste of "dd..." inserts text
instead of deleting two lines. In a real SDL window, SPC y then SPC p round
trips through the system clipboard while the default register holds different
text. Setting tty_blank back to .prompt_and_input reproduces all 86 old
goldens byte for byte.
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Every keystroke in a shell pane rebuilt the motion surface from scratch:
shellRows dumped ghostty's WHOLE history+active grid, split it, blanked the
prompt rows and handed back slices into the scratch arena, which the next
update threw away. A pane sitting on a multi-megabyte agent transcript paid an
O(scrollback) dump per press of `j`, and paid it once or twice per key, since
flatSurface then rebuilt the same rows joined by '\n' beside it.
The dump is now memoized against the pane it was built for (term_pane.RowsCache
on Pardes.shell_rows), gpa-owned rather than scratch-arena because the whole
point is to outlive the update that built it. One entry, not a table: the
surface is built for the pane the cursor is in, and a second pane asking would
only double a multi-megabyte buffer for a slot it is about to lose again. A
pane that is not the live one is answered from the arena as before.
The lifetime rule is the part that would have rotted silently, so it is one
rule and it is written down: `rows` is handed out to callers, so everything
that notices the entry has gone bad — output arrived, the grid reflowed, the
pane died, another pane wants the slot — only marks it `stale`, and the
buffers are freed in exactly two places, `sweep` at the TOP of an update
before any handler can be holding them, and `reset` when the editor goes away.
Nothing frees mid-update. dropPane clears the pointer immediately though: a
freed pane's address comes back from the allocator as a different pane, and an
entry still naming it would answer for the wrong grid.
Two things fall out of having the join already:
- flatSurface returns the memo's `text` verbatim when the lines it was handed
are the cached rows untouched, instead of rebuilding the join.
- paneCursorLines returns `rows` directly when there is no edit buffer, where
it used to copy the array one slice at a time to produce exactly what it was
given.
One bug on the way past, in the same function: an EMPTY edit buffer writes one
line but modal.lineCount("") is 0, so `ls` was sized one short of what the
loop writes — the same floor the paste site needs. Killing a whole line
(`A<C-u>`, `d%`) on a buffer covering the last row made that a length of zero.
And test/perf.zig grows the axis that would have caught this: a terminal
scoreboard beside the file one, three scrollback fixtures (64 KiB, 1 MiB,
8 MiB — half the ceiling) against render / output / resize-rows / resize-cols /
key-down / edit-char, sharing the existing text and JSON reports and the
--base comparison. resize-cols and resize-rows are both there because a COLUMN
change reflows every page in the list and a row change does not.
Measured on that table: key-down is 142 / 630 / 636 us across the three
fixtures — flat from 1 MiB to 8 MiB, which is the dump being gone, and render
flat at ~110 us throughout. What remains of key-down's step at 1 MiB is the
linear scan indexOf refuses to index for a terminal; that is now a ponytail
waiver naming its own price (615 us against 140 us) and the threading through
paneOff/panePos/paneLineStart it would cost, to be done the day 0.6 ms shows
up next to something anybody can feel.
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theming, and mupdf -Djpx
Three commits off 38e9919 (macos-app@upstream) merged into main's ghostty bump.
No textual conflicts, and two things the merge needed:
- nested.zig asked libc for fstatat. Darwin has it; on linux std.c declares it
`void` (glibc hides it behind a versioned symbol std cannot name), so the tty
build stopped at 'type void not a function'. statNoFollow keeps fstatat on
darwin and asks statx on linux for the same three fields, which is what this
file did before the branch generalized it to both platforms.
- .DS_Store rode along with a797a1a. Deleted, and .gitignore now says so.
linux: snap 86/86, unit-test, image-harness and mupdf-check green. nested.zig
also type-checks for aarch64-macos.
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The AppKit shell now draws what the core renders, follows the theme without a
relaunch, and builds into something you can hand to someone.
- Pixel attachments. Surface.images was dropped on the floor here, so a PDF
pane showed nothing at all: native_images is now set, pardes_image_s carries
the geometry the core already clipped, and PardesView keeps one CGImage per
(serial, page, revision) so scrolling costs a draw and not a decode. Image
panes get real pixels instead of the petscii fallback.
- Themes take hold live. pardes_tick never advanced the chrome animation, so
every tagline kept the previous theme's colours until the next launch and
the 16 ms re-pump spun for the rest of the session. pardes_theme_bg retires
the hand-agreed #121212 and drives the window background and the titlebar
appearance; a theme with no background of its own now gets a transparent
window over an NSVisualEffectView.
- The cell snaps to whole DEVICE pixels rather than whole points. Monaco
advances 8.4014pt at 14, so ceiling to 9 spaced every column 7.1% wider than
the face was drawn for.
- The dial is one notch per 10 degrees instead of 20, and a release keeps
turning in proportion to how hard it was thrown -- ramping up from zero at
the floor, so a slow twist coasts not a little but not at all.
- A file dropped on the grid is a click plus Look, so it opens beside the pane
it was dropped on. No drop concept was added to the core.
- The titlebar follows the focused pane: proxy icon, filename, and the dirty
dot. File.saved_revision is the watermark that last one needed.
- Config (SPC f c) prints the resolved startup config path.
- build.zig assembles, signs and packages the bundle itself; build-app.sh is
gone. -Dmacos-identity= takes a Developer ID, macos-dmg makes the image, and
the icon is Glenda.
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- build.zig.zon: bump ghostty ba38b493 -> 82e53e3f (translate-c backport, fixes 404 on cold cache), update hash
- src/pardes.zig: adapt Terminal.init/resize to new std.Io signatures; fix display-column conversion for tabs and clicks past EOL (fileRawDisplayCol/fileRawAtDisplay)
- test/e2e_harness.zig: adapt to new ghostty_vt signatures
- snap suite 86/86 green
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Esc ran Toggleterm, which hopped between the newest DOC and the newest
TERMINAL. That distinction never earned its keep. It made Esc unpredictable —
which of three panes you landed on depended on their kinds, not on where you
had been — and it could not alternate between two files at all, which is the
case you hit most. Editing two files, Esc did nothing.
The replacement already existed. Last (SPC j j) is "the pane you were in
before this one, whichever it was": it walks the jump stack for the newest
entry naming a different pane and restores its line and column. So Esc, and
Shift-Esc in tty, now run Last, and Toggleterm is deleted rather than renamed
— a third implementation of "go to the other pane" was the thing to avoid.
SPC w t goes with it; the w group is the four directional moves, and the jump
group already had SPC j j.
Held down, Esc alternates. Two files, a file and its shell, a file and a
+Search — all the same, because Last has no notion of kind to get wrong.
This depends on the swap in the same series: Last reads the stack backwards,
and until hopping stopped appending, the pane you came from could fall off it.
windownav.snap needed only its keys and prose changed — its golden did not
move at all, which is the useful evidence here: for the one scenario the old
builtin handled well, Last produces an identical focus sequence.
Coverage for what it did not handle is new: a unit test opens a second FILE by
looking its name and asserts Esc alternates between two panes of the SAME
kind, which is the case that used to be a no-op.
Docs follow: tutor.txt, docs/helix-keys.md, docs/design.typ, and the builtin
index goldens, which are now one row shorter.
75/75 snapshots, both unit suites, and the macOS ABI build all pass.
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Adds -Dplatform=macos, a fourth backend beside tty, gui and web. Zig keeps the
core, the ptys, every effect and the worker threads; Swift owns NSApplication,
the window, input translation, and drawing the cell grid with CoreText. They
meet at a hand-written C ABI in src/macos/pardes.h, built as a static library
the app links.
The ABI is src/web.zig's boundary with the wasm removed, because both hosts are
the same animal: someone else owns the clock, feeds events in through flat
functions, and reads one packed cell buffer out. The browser proved the shape.
The one divergence is that the browser has no processes and forwards every
effect to JavaScript, whereas forkpty is right here, so src/macos.zig performs
them — spawn, write, resize_pty, save_file, new_file, write_dump, open_link,
set_clipboard. lsp, pipe and watch are answered with nothing and marked; the
core already tolerates that, since the browser answers none of them either.
This deliberately inverts ghostty's split, which was studied first and is
written up in docs/ghostty-macos-notes.md. Ghostty hands Zig a bare NSView*,
installs its own CALayer and owns the frame clock; Swift never renders. Pardes
does the opposite because its frame is already a cell grid and CoreText draws
one natively — the alternative is a second hand-rolled glyph atlas, which is
what most of gui.zig's 4,300 lines already are. It would also have been written
blind: the Swift half cannot be compiled here.
What makes the scaffold verifiable rather than dead code is that the Zig half is
ordinary POSIX and builds and tests on Linux. Borrowing ghostty's best trick,
build.zig translate-C's the header into the test build and src/macos.zig asserts
every constant, struct layout, and exported function's arity and widths against
it. That guard earned its place immediately: pardes_scroll grew a cell
coordinate after the Swift view had been written against the older form.
Skipped, and named as the upgrade path in docs/macos.md: the Xcode project,
xcframework, lipo and codesigning ghostty needs. All four exist for
distribution; a dev build is a swiftc invocation and a directory with a plist.
The Swift app is a scaffold and says so — every uncertain API spelling carries
an UNVERIFIED marker, and no part of it has been compiled.
tty is unaffected: 75/75 snapshot scripts and both unit suites pass.
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