M4.10: neutral file, preference and MCP wording; vendor-name CI gate

Edit -> "PDF Presets…"; the clipboard preferences read "Legacy vector
clipboard (no transparency)" / "Legacy vector clipboard" (keys copyAicb and
aicbMode unchanged); the second keyboard shortcut set is "Classic Defaults",
and the old set name is still accepted from saved UI preferences, imported
sets and shortcuts.preset. The MCP server instructions, the apply_effect and
create_graph tool descriptions, the text.createInPath params doc,
docs/mcp.md, the ui-egui crate description and the PDF compatibility docs
no longer name another vendor.

New `cargo xtask brands` (run by `cargo xtask ci`) fails on vendor product
or company names in Rust string literals (labels, params docs, menus,
panels, MCP definitions; comments and test code skipped), Cargo.toml
descriptions and text under docs/ and packaging/; a required legacy alias
is marked `brand-ok`. xtask shares one git file listing between the asset
and brand checks. docs/development.md describes the gate.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/prefscmds.rs

@@ -269,12 +269,12 @@ pub const PREF_SPECS: &[PrefSpec] = &[
     // Clipboard Handling
     p!("copyAsSvg", "Clipboard Handling", "On Copy", "Include SVG Code", bool),
     p!("copyAsPdf", "Clipboard Handling", "On Copy", "PDF", bool),
-    p!("copyAicb", "Clipboard Handling", "On Copy", "AICB (no transparency support)", bool),
+    p!("copyAicb", "Clipboard Handling", "On Copy", "Legacy vector clipboard (no transparency)", bool),
     p!(
         "aicbMode",
         "Clipboard Handling",
         "On Copy",
-        "AICB",
+        "Legacy vector clipboard",
         choice(&[("preservePaths", "Preserve Paths"), ("preserveAppearance", "Preserve Appearance and Overprints")])
     ),
     p!(

crates/engine/src/cmd/textedit.rs

@@ -44,7 +44,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Area / Path Type",
             [],
             None,
-            "{path: id, mode: \"area\"|\"onPath\", text?: \"\", at?: [x, y] (on-path start: nearest point), size?, font?} turn a path into an area-type frame or a type-on-a-path baseline (the path's paint is dropped, like Illustrator) → {id}",
+            "{path: id, mode: \"area\"|\"onPath\", text?: \"\", at?: [x, y] (on-path start: nearest point), size?, font?} turn a path into an area-type frame or a type-on-a-path baseline (the path's paint is dropped) → {id}",
             has_doc,
             create_in_path
         ),