Automation: errors name a path outside the read roots by its file name

Under --automation-read-root, an error about a file or folder the client
did not give now names it whole only when it is inside the read roots.
Outside them it names the file or folder by its file name, or as "a file
or folder outside the read roots" when it has none, and keeps the roots
and the reason. A path the client gives stays whole.

This covers a save without a path (the document's own file and the files
written beside it, also inside action.batch, and the refusal to write
over a file read with losses), file.revert, script.listInstalled,
plugin.reload without a path and plugin.list's folder report, and
links.relink with copy (the document's folder, its error when the
document's path has no folder, and the copies in the reply). Export for
Screens' refusal for an export preset's folder uses the same helper.

docs/mcp.md

@@ -202,6 +202,12 @@ the suite) keep the agent to the folders you give it:
   `outside the write roots /work/project/out, /tmp/scratch: …`) or
   `automation filesystem access is not granted: write authority is absent: /work/project/out/x.png`.
   Links in an opened document that point outside the read roots show as missing.
+- An error names a path the client gave as given. A path the client did not give (the document's own file
+  in a save without `path` and in `file.revert`, also inside `action.batch`, an export preset's folder, the
+  Scripts folder, the Additional Plug-ins Folder, the document's folder in `links.relink {copy}`) is named
+  whole only inside the read roots; outside them the error names it by its file name, or as
+  `a file or folder outside the read roots` when it has none, and keeps the roots and the reason, for example
+  `automation path rejected: outside the write root /work/project/out: poster.vectorcraft`.
 - The preferences that move folders the app reads or writes on its own (`fontsFolder`,
   `pluginsFolder`, `recoveryFolder`, `templatesFolder`) can only be set inside the roots. The app's own folders
   (preferences, Data Recovery, the User Defined library folders, VectorCraft's Fonts folder) are not

docs/target-app-parity.md

@@ -764,6 +764,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - Scripts folder: File › Scripts lists the `.js` and `.jsx` files of the `Scripts` folder next to the preferences, each named after its file without the extension, with each subfolder as a submenu, above Check Script… and Other Script… (https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/install-and-run-scripts.html). VectorCraft's own rules: the folder is read again when the window becomes active and when the File menu opens (in the macOS menu bar, when any of its menus opens, and the new listing shows the next time the menu opens), links are not followed, and one read stops at 2,048 entries, 512 scripts, 128 subfolders, 4 levels or 250 ms. `script.listInstalled` returns the listing. `crates/engine/src/tests/script_folder.rs`, `crates/ui-egui/src/tests/scripts_menu.rs`.
   - Open Recent Files under `--automation-read-root`: the control channel's `ui.menu.list` and `file.recentFiles` leave out the recent files outside the read roots, the other rows keep their ids, and `file.openRecentN` for one outside them answers `no such recent file`, as an empty slot does. `crates/ui-egui/src/tests/automation.rs`.
   - Saves, Export for Screens and Package under `--automation-read-root`: a save without a path leaves the document's own file out of its reply, and a save without a path known leaves out the suggested folder, when they are outside the read roots; Export for Screens into an export preset's folder outside them lists its files relative to that folder and names that folder by its name in an error, and the export settings and saved presets leave out a folder outside them when read or exported; Package's report and warnings, and Document Info's linked images, name a file outside them by its file name. A path the client gives stays in the reply. `crates/engine/src/tests/save.rs`, `crates/engine/src/cmd/fileio/tests_screens.rs`, `crates/engine/src/tests/package.rs`, `crates/ui-egui/src/tests/automation.rs`.
+  - Errors under `--automation-read-root`: a refused save without a path and `file.revert` (also as an `action.batch` step), `script.listInstalled`, `plugin.reload` without a path and `links.relink {copy}` name the document's own file, the Scripts folder, the Additional Plug-ins Folder or the document's folder by its file name when it is outside the read roots, and keep the roots and the reason; `plugin.list`'s folder report and `links.relink`'s copies name such a folder or file by its file name too. A path the client gives stays whole. `crates/engine/src/tests/save.rs` (`pathless_save_rejection_hides_document_folder`), `crates/engine/src/cmd/fileio/action_batch.rs`, `crates/engine/src/tests/plugins.rs`, `crates/engine/src/tests/links.rs`, `crates/engine/src/tests/script_folder.rs`.
   - `ui.inspect` under `--automation-read-root`: the documents still opening, the recent files, library panels' files and folder preferences (saved, and in an open Preferences dialog) outside the read roots are left out of the reply, a library loaded from outside them shows by its file name in `ui.inspect` and `ui.docking`, and the app's state is not changed. `crates/ui-egui/src/tests/automation.rs` (`ui_inspect_leaves_out_paths_outside_the_read_root`).
   - Link replies under `--automation-read-root`: `links.list`, `links.check`, `links.info` and `document.open`'s link rows leave out the path, found path and folder of a linked file outside the read roots, and the stored size and date of it in `links.info`; each row keeps its id, file name and status, and the document's links are not changed. `crates/engine/src/tests/linkspanel.rs` (`link_paths_outside_the_read_roots_are_left_out`), `crates/engine/src/tests/placed_document.rs` (`link_info_leaves_out_a_placed_documents_path_outside_the_read_roots`).
   - Linked-file and font-file searches under `--automation-read-root`: `links.findFiles` and `text.findFontFiles` replies, also later polls and stops of a search another client started, leave out the files found, a link's saved path and the folder searched outside the caller's read roots, and a failed search gives its reason without the path; `image.info` gives `link: null` for a linked file outside them; `text.addFontFiles` gives `folder: null` and the copies' file names when the Fonts folder is outside them. `crates/engine/src/tests/linkfiles.rs`, `crates/engine/src/tests/fontfiles.rs`, `crates/engine/tests/font_folder.rs`.