Milestone 14 — A Rust code editor: the plan

Scope

packages/editors/code-native — NativeCodeExtension (dev.moonkale.editor-code-native, opt-in): a panel per text document it claims, dioxus-code-editor inside, the same toolbar as CodeMirror’s (path, dirty dot, language, Save, Reload) plus the CodeMirror switch; language from Node::language_hint → Language::from_slug; theme follows the app theme (CodeTheme::system); edits replace Document.text; Ctrl+S saves. Grammars: the core languages only (features lang-*), not all-languages.
Claiming: Workspace::editor_for(node) -> "codemirror" | "native" from the per-document choice (editor_choice), else editor.implementation, else whichever extension is enabled; both extensions filter documents by it; the CodeMirror panel gets a Rust switch. Settings under both rows.
Cursor word: Workspace::{cursor, set_cursor, cursor_word()} (line, col of the active document’s caret); the CodeMirror panel passes the column it already receives; the native panel reads selectionStart on caret-moving events. word_at unit-tested.
Rust terminal rows cut (P-112): re-measure on a timer + anchor to the bottom.
Verify (E2E code-native.mjs: enable, open main.rs in Rust editor, highlighted spans, type + save, switch back to CodeMirror and forward; cursor_word checked through the status bar or a data attribute), log, vault, Extension Catalogue, JavaScript Inventory.

No modal chooser for editors (opening must be instant); the setting decides, the toolbar switches.
all-languages off: ~100 grammars would double compile time; the core list is enough and matches Core Languages.
The one JS touch in the Rust editor (reading selectionStart) is Dioxus’s eval, not a bundle; documented in JavaScript Inventory.

risk	mitigation
`dioxus-code-editor` 0.1.x churns	pinned; the extension is 300 lines around it
big files in a textarea + full re-highlight per keystroke	the crate highlights incrementally; Case Selector still points big files at plain text
the textarea’s undo is lost on switching editors	stated in the docs; the document’s text is what carries over