File formats: PostScript (.ps) and .epsf files open and place

The EPS reader read PostScript by any name, but the Open and Place
dialogs hid .ps and .epsf files, and a .ps or .epsf file whose header
is only %! could not be opened or placed ("not a format VectorCraft
reads"). The reference app lists .eps, .epsf and .ps under Open and
Place.

- A read-only PostScript format (ps) joins the format table. A .ps
  file opens and places through the EPS reader and reports the
  ps format. document.export does not write .ps; file.print does.
- .epsf is an EPS extension.
- OPEN_EXTS and PLACE_EXTS list epsf and ps, so the dialogs, the CLI
  help and the MCP open_file description list them.
  UNASSOCIATED_EXTS lists them too: the macOS bundle declares neither.
- A .ps or .epsf file whose header is only %! now pastes as EPS when
  copied in a file manager, as one with a %!PS header already did, and
  clipboard.importEps reads PostScript whose header is only %!, which
  it rejected before.

Docs: docs/mcp.md, docs/file-format-parity.md (.ps row),
docs/target-app-parity.md.

docs/mcp.md

@@ -342,7 +342,7 @@ objects' fills or strokes differ (`fillMixed` / `strokeMixed`, drawn as a "?" pr
 | `invoke_menu` | `{command, params?}` | Invokes a menu item by command id. Includes UI commands such as `view.*` and `window.*` in remote mode. |
 | `open_panel` | `{panel}` | Remote only. `panel` is a panel id (`layers`, `swatches`, `colorGuide`, …, as `window.panel` takes) or its display label (`"Color Guide"`), in any case. |
 | `screenshot` | `{path?, scale?, artboard?, window?}` | Returns MCP image content (`image/png`, base64) plus a text block. Renders the artboard; `window:true` captures the app window (remote only). With `path` the backend (the headless session or the app) writes the PNG there too. |
-| `open_file` | `{path}` | Opens any readable file as a new active document: `.vectorcraft`/`.drawcraft`, `.vctemplate`, `.svg`/`.svgz`, `.pdf`/`.ai`, `.ait`, `.eps`, `.dxf`, `.emf`, `.wmf`, PNG, JPEG, GIF, WebP, TIFF, BMP, PSD/PSB (an image opens as a document of its pixel size; a Photoshop file as its merged image). Templates (`.vctemplate`, `.ait`) open as a new untitled document. PDF, `.ai` and SVG files saved with Preserve Editing reopen as the document they carry. The reply is `document.open`'s: its `warnings` say what didn't come in as it was (an EPS whose PostScript can't be read opens as its preview, and the warning names the PostScript error, the operator and the procedure). `run_command document.formats` lists the formats. |
+| `open_file` | `{path}` | Opens any readable file as a new active document: `.vectorcraft`/`.drawcraft`, `.vctemplate`, `.svg`/`.svgz`, `.pdf`/`.ai`, `.ait`, `.eps`/`.epsf`, `.ps`, `.dxf`, `.emf`, `.wmf`, PNG, JPEG, GIF, WebP, TIFF, BMP, PSD/PSB (an image opens as a document of its pixel size; a Photoshop file as its merged image). Templates (`.vctemplate`, `.ait`) open as a new untitled document. PDF, `.ai` and SVG files saved with Preserve Editing reopen as the document they carry. The reply is `document.open`'s: its `warnings` say what didn't come in as it was (an EPS whose PostScript can't be read opens as its preview, and the warning names the PostScript error, the operator and the procedure). `run_command document.formats` lists the formats. |
 | `save_file` | `{path?}` | Runs `document.save`: the document's own file in its own format (native `.vectorcraft` unless it was opened from or saved as SVG, PDF or a restorable `.ai`; then `warnings` say what that format loses). A path's extension picks the format (`.vectorcraft`, `.vctemplate`, `.pdf`, `.svg`, `.svgz`, `.ai`: a PDF carrying the native document, which reopens editable). |
 | `export` | `{path?, format?, scale?, artboard?, range?, selection?, outlineText?, options?}` | `svg`, `svgz`, `pdf`, `eps`, `dxf`, `emf`, `wmf`, `png`, `jpg`, `webp`, `gif`, `png8` (an indexed `.png`), `tiff`, `bmp`, `tga`, `psd` (layered), `txt` (the document's text), `vectorcraft` or `template` (a native template). The tool's `format` enum and `document.formats` list them, generated from the engine's format table. When `format` is omitted, it comes from the path's extension. PDF writes one page per artboard: all of them, or `artboard` (0-based) / `range` (`"1-3, 5"`, 1-based); the other formats write one artboard. `options` carries more format options (e.g. `{"quality": 80}` for JPEG). `selection: true` exports the selected objects cropped to their bounds (the reply adds their `bounds`, and reports `format` and the encoder's `warnings` as a whole-document export does); `outlineText: true` writes SVG text as paths. Template layers are left out, live effects are kept, and exporting `vectorcraft` never changes the document's path. Without `path` the bytes come back as `dataBase64`. Both backends run the same `document.export` call. |
 | `add_text` | `{text, x?, y?, width?, height?, fit?, fitMinPercent?, path?, mode?, pathEffect?, size?, font?, color?, justify?, vertical?}` | Point type at (x, y) (`justify`: `left`, `center` or `right` starts, centres or ends each line on x); area type with `width`/`height` (`fit`: `none`, `autoHeight`, `shrinkText`, as `text.areaOptions`); or `path` + `mode` (`area`/`onPath`) to flow text in or along a path, with `pathEffect` (`rainbow`, `skew`, `3dRibbon`, `stairStep`, `gravity`); `justify` (also `auto`, `justifyAll`) aligns the paragraphs of every kind, as `text.setStyle` does later. `vertical: true` uses the existing vertical writing mode for every kind (default `false`, horizontal). Returns `{id}`, with `overflow: true` when the text doesn't fit its frame or path. |
@@ -643,7 +643,7 @@ CMYK too.
 {"name":"run_command","arguments":{"command":"document.open","params":{"path":"/tmp/brochure.pdf","pages":"2-3","cropTo":"trim"}}}
 ```
 
-PostScript files (`.eps`, and `.ai` files saved in older formats or without PDF compatibility) open through the EPS
+PostScript files (`.eps`, `.epsf`, `.ps`, and `.ai` files saved in older formats or without PDF compatibility) open through the EPS
 reader (see EPS and PostScript import). An `.ai` saved without PDF compatibility (its PDF part is only a placeholder
 page) opens from its editing data alone: its type is made from the file's text document where it can be (point type,
 area type and type on a path), and what can't be is left out with a warning. Non-native art (the content of a placed
@@ -3062,8 +3062,9 @@ refused with the list of presets.
 
 ## EPS and PostScript import
 
-`document.open` and `file.place` read `.eps` files, and PostScript by any name (an `.ai` saved without PDF
-compatibility opens as artwork; an `.ait` one as a new untitled document). An EPS file VectorCraft wrote restores the
+`document.open` and `file.place` read `.eps`, `.epsf` and `.ps` files, and PostScript by any name (an `.ai` saved
+without PDF compatibility opens as artwork; an `.ait` one as a new untitled document). A `.ps` file reports the format
+`ps`, which `document.export` doesn't write (`file.print` writes PostScript). An EPS file VectorCraft wrote restores the
 document it carries (`restored: true`, as Preserve Editing does for PDF and SVG); when that document can't be read the
 PostScript is read instead and the first warning says why.