add New builtin for an empty temporary file in the calling column

2 files changed, 7 insertions, 5 deletions

diff --git a/docs/design.typ b/docs/design.typ
index 69c138f2..71653594 100644
--- a/docs/design.typ
+++ b/docs/design.typ
@@ -69,8 +69,9 @@ graphics when available.)
 
 *Effect* (out, queued): `spawn{pane, cwd}`, `write{pane, bytes}`,
 `resize_pty{pane, cols, rows}`, `open_link{url}`, `read_file{path}`,
-`set_clipboard`, `bell`, `quit`. The core never performs IO; it asks. This is
-what makes the browser build honest instead of a fork: a wasm shell simply
+`new_file{pane, serial}`, `set_clipboard`, `bell`, `quit`. The core never
+performs IO; it asks. This is what makes the browser build honest instead of a
+fork: a wasm shell simply
 answers `spawn` differently (or not at all) — the core does not know.
 
 Platform divergence inside the core is a comptime tag, used the way the stdlib
@@ -235,7 +236,8 @@ mirrors out via OSC 52.
 *Tag.* Live prefix (mode indicator, cwd or path) + editable tail with the
 full modal editor; defaults `Del` / `Save Del`; an image tag is `img <path> Del`
 like any other (its renderer toggles are builtins under `SPC t p/l/a`). Topbar:
-`Kill Newcol Tutor Debug NextColor Dump` — execute-only (left click inert);
+`Kill Newcol Tutor Debug NextColor Dump Find Grep New Help` — execute-only
+(left click inert);
 Colors and Crt left it for their leader paths.
 
 *Panes.* Terminal: ghostty-vt, 16 MiB scrollback, OSC 133 prompt semantics,
diff --git a/docs/helix-keys.md b/docs/helix-keys.md
index 7fc318ba..17e57fe0 100644
--- a/docs/helix-keys.md
+++ b/docs/helix-keys.md
@@ -88,11 +88,11 @@ with a reason in `test/hxcases/waivers.jsonl`.
 | `Enter` (normal) | acme **look** chord: EXPLICIT selection, else file-ish word under cursor | pardes-specific, keep (helix normal-mode Enter unbound). Covers helix `gf`. Implicit motion residue falls back to the cursor word | pardes-specific |
 | `Tab` (normal) | acme **execute** chord | pardes-specific, keep; explicit-selection rule as Enter | pardes-specific |
 | `:` (normal, body) | focuses the pane's OWN tag as a one-line editor in **normal** mode, parked at the first EDITABLE column: motions (`w` `b` `e` `W` `B` `E`, `0` `$` `^`, arrows, `Home`/`End`) walk the whole rendered tag, `y` yanks the selection, `Enter`/`Tab` look/execute it (else the file-ish word under the cursor), `i`/`a`/`I`/`A` enter insert, `Esc` hands the body back. `h`/`j`/`k`/`l` are NOT motion here — a tagline is a place in the LAYOUT, so they run the same `Left`/`Down`/`Up`/`Right` builtins and land on the neighbouring pane's TAGLINE, still in normal mode (nothing that way = stay put, EXCEPT `k` off the topmost tagline — see the next row); the arrows keep the in-tag motion | helix `:` is command mode (section C); pardes' commands are acme words that live in the tag. `tag_col`/`tag_anchor` are columns of the RENDERED tag (prefix ++ tail) — one coordinate space, so the live mode+path prefix is selectable, yankable and executable, while every edit op (typing, `Backspace`, `i`/`a`/`I`/`A`) measures from the first editable column and is inert inside it | pardes-specific |
-| `k` (tag normal, topmost tagline) | focuses the TOPBAR — row 0, the global tagline (`Kill Newcol Tutor Debug NextColor Dump`, plus `Restore <path>` once a dump exists). It is its own one-line normal mode: `h`/`l` and the arrows by grapheme (row 0 has no window left or right to walk to), `w`/`b`/`e`/`W`/`B`/`E` and `0`/`$`/`^` by word, `Enter`/`Tab` runs the word under the cursor through the same dispatch a MIDDLE click on it uses, `j` drops back onto the topmost pane's tagline, `Esc` leaves. No insert mode and no selection — the bar is chrome with no tail to own | pardes-specific. The topbar is not a pane, so `focusDir` can never reach it: this is a fallback on the `.Up` branch of the tagline hop, from a TAGLINE only (a body's `SPC w k`/`Ctrl-w k` keep their pane-to-pane meaning). Its whole state is one global `topbar_col: ?u16` (row 0 has no pane to hang it on), cleared by any mouse press and BEFORE the chord dispatch, because `Kill` up here frees the session the way `Del` frees a pane. The motion vocabulary is literally the tag's — both call `lineMotion` | pardes-specific |
+| `k` (tag normal, topmost tagline) | focuses the TOPBAR — row 0, the global tagline (`Kill Newcol Tutor Debug NextColor Dump Find Grep New Help`, plus `Restore <path>` once a dump exists). It is its own one-line normal mode: `h`/`l` and the arrows by grapheme (row 0 has no window left or right to walk to), `w`/`b`/`e`/`W`/`B`/`E` and `0`/`$`/`^` by word, `Enter`/`Tab` runs the word under the cursor through the same dispatch a MIDDLE click on it uses, `j` drops back onto the topmost pane's tagline, `Esc` leaves. No insert mode and no selection — the bar is chrome with no tail to own | pardes-specific. The topbar is not a pane, so `focusDir` can never reach it: this is a fallback on the `.Up` branch of the tagline hop, from a TAGLINE only (a body's `SPC w k`/`Ctrl-w k` keep their pane-to-pane meaning). Its whole state is one global `topbar_col: ?u16` (row 0 has no pane to hang it on), cleared by any mouse press and BEFORE the chord dispatch, because `Kill` up here frees the session the way `Del` frees a pane. The motion vocabulary is literally the tag's — both call `lineMotion` | pardes-specific |
 | `Ctrl-w` + `h/j/k/l`/arrows | directional pane focus prefix — normal/tty modes only | pardes' own window handling (helix window mode skipped, section C). Runs the SAME `Left`/`Down`/`Up`/`Right` builtins `SPC w h/j/k/l` runs; kept alongside the leader because a pane in raw **tty** mode never sees `SPC` (the shell owns it), so this is the only keyboard way out of one. Insert mode owns `Ctrl-w` = delete-word-back, so a tag being TYPED into swallows it; from a tag in normal mode (`:`) it moves focus to the neighbour's BODY, while the bare letters `h/j/k/l` there move to its TAGLINE (next row) | pardes-specific |
 | `Alt-n` | new terminal below (any mode) | shadows helix `Alt-n` TS sibling-select — skipped anyway (tree-sitter) | pardes-specific |
 | `Alt-c` | move active terminal to a fresh column (any mode) | helix `Alt-c` is change-noyank; the pardes window op wins (do-not-touch contract). `Alt-d` + `i` covers the behavior | waived (`alt-c-window-op`) |
-| `Space` (normal, body) | the pardes LEADER: a key path from here runs a BUILTIN with no arguments — the same builtins the topbar and the tags hold. `SPC k` Kill, `SPC d` Del, `SPC f s` Save, `SPC f f` Find (fd over the pane's directory, results into `+Search`), `SPC f g` Grep (grep -R over the CONTENTS of every pane's directory, the ones another pane already covers dropped, rows relative to the asking pane's own directory, results into `+Search`; like Find it takes an ARGUMENT — `Grep foo` executed, or a selection chorded onto the word, searches that and skips the input), `SPC h t` Tutor, `SPC c n`/`SPC c d` Newcol/Delcol, `SPC t d/c/n/r` Debug/Colors/NextColor/Crt, `SPC t t` ThemeSel (the whole theme ring as `Theme <name>` rows in an output buffer — the one list whose rows are COMMANDS, so n/N execute each row instead of looking it and stepping is a live preview), `SPC t p/l/a` Petscii/Palette/Ascii (an image pane's renderer toggles — the words its tag used to spell out, so the bar stays a bar), `SPC s d`/`SPC s r` Dump/Restore, `SPC w h/j/k/l` Left/Down/Up/Right (directional pane focus — the `Ctrl-w` prefix's four moves as builtins), `SPC w t` Toggleterm (focus hops between the most recently focused document — file, image or `+Search`/`+Help` buffer — and the most recently focused terminal; the same key hops back). `?` at ANY depth opens the Help builtin listing what the prefix can still reach (`SPC ?` = all, `SPC h ?` = the docs group), into a `+Help` output buffer. The pending path shows at the right edge of the active pane's tag; Esc — or any unmapped key — abandons it | helix spends Space on pickers/LSP (section C); pardes has neither, and acme's builtins are what a leader is for. Enum-derived: the paths, the Help lines and the execute dispatch all fold out of one `Builtin` enum at comptime. Normal mode on a BODY only — tags are always insert, tty keys belong to the program | pardes-specific |
+| `Space` (normal, body) | the pardes LEADER: a key path from here runs a BUILTIN with no arguments — the same builtins the topbar and the tags hold. `SPC k` Kill, `SPC d` Del, `SPC f s` Save, `SPC f n` New (an empty temporary file focused in the calling pane's column), `SPC f f` Find (fd over the pane's directory, results into `+Search`), `SPC f g` Grep (grep -R over the CONTENTS of every pane's directory, the ones another pane already covers dropped, rows relative to the asking pane's own directory, results into `+Search`; like Find it takes an ARGUMENT — `Grep foo` executed, or a selection chorded onto the word, searches that and skips the input), `SPC h t` Tutor, `SPC c n`/`SPC c d` Newcol/Delcol, `SPC t d/c/n/r` Debug/Colors/NextColor/Crt, `SPC t t` ThemeSel (the whole theme ring as `Theme <name>` rows in an output buffer — the one list whose rows are COMMANDS, so n/N execute each row instead of looking it and stepping is a live preview), `SPC t p/l/a` Petscii/Palette/Ascii (an image pane's renderer toggles — the words its tag used to spell out, so the bar stays a bar), `SPC s d`/`SPC s r` Dump/Restore, `SPC w h/j/k/l` Left/Down/Up/Right (directional pane focus — the `Ctrl-w` prefix's four moves as builtins), `SPC w t` Toggleterm (focus hops between the most recently focused document — file, image or `+Search`/`+Help` buffer — and the most recently focused terminal; the same key hops back). `?` at ANY depth opens the Help builtin listing what the prefix can still reach (`SPC ?` = all, `SPC h ?` = the docs group), into a `+Help` output buffer. The pending path shows at the right edge of the active pane's tag; Esc — or any unmapped key — abandons it | helix spends Space on pickers/LSP (section C); pardes has neither, and acme's builtins are what a leader is for. Enum-derived: the paths, the Help lines and the execute dispatch all fold out of one `Builtin` enum at comptime. Normal mode on a BODY only — tags are always insert, tty keys belong to the program | pardes-specific |
 | `/` then `n`/`N` (any pane) | pardes' own plain-substring search into a `+Search` output buffer, n/N walk the result rows and look them (EXPLICIT selections) | KEEP, do not touch; not in the corpus (helix `/` is regex search) | pardes-specific |
 | `n`/`N` (terminal panes, no search armed) | lookable-token motion over scrollback (EXPLICIT selections) | KEEP, do not touch | pardes-specific |
 | insert: printable text | file: real edit; terminal: typed run splice | | helix-verified (file) |