Update HANDOFF.md: editor-UX batch done on dev, awaiting eye-check

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

HANDOFF.md

@@ -5,7 +5,19 @@ captures where we are, how we work, and exactly what to do next. Authoritative
 roadmap is `PLAN.md`; project rules are `CLAUDE.md`; this is the "current
 state + how to continue" snapshot.
 
-_Last updated: 2026-06-17. **`main` and `dev` are aligned.** **Stage 9 — Physics
+_Last updated: 2026-07-10. **`dev` is 4 GUI commits ahead of `main` — the whole
+Stage-10 editor-UX batch is DONE and on `dev`, awaiting the maintainer's
+eye-check** (New Script button, open-script-in-editor + External Editor
+preference, native rfd folder picker on New/Open Project, Unity-style file
+explorer in the Project panel). Pure-logic groundwork (AssetDatabase
+uid-preserving file ops `move_asset`/`move_folder`/`delete_asset`, whole-tree
+`scan`, script template/creation helpers, Rust-1.97 lint fixes) is already on
+`main`. After the maintainer approves the batch:
+`git checkout main -q && git merge --ff-only dev -q && git push origin main && git checkout dev -q`.
+That closes Stage 10 (parked: editor-authored joint components need a
+serializable entity-reference type). Next up per PLAN.md: Stage 11._
+
+_Older status (2026-06-17): **Stage 9 — Physics
 is ✅ COMPLETE on `main`.** **Stage 10 — Scripting, Live Reload & Editor Terminal:
 core ✅ on `main`** (all eye-checked & approved 2026-06-17 in the `untitled`
 project): the `oxide-script` crate (`Script` + `.rhai` loader + sandboxed
@@ -194,6 +206,27 @@ registry.register_reflected::<Timer>("Timer");   // editor + scripts
 
 ### Remaining for Stage 10
 
+**The editor-UX batch below is ✅ DONE (2026-07-10) — all four items are on
+`dev` as separate commits awaiting one eye-check pass** (details in each
+commit message + PLAN.md "Editor-UX follow-ups" + `docs/assets.md` /
+`docs/scripting.md` / `docs/projects.md`):
+
+| Piece | Commit | What to eye-check |
+|-------|--------|-------------------|
+| New Script button | `4f1e9a4` | Script inspector: name + ➕ creates/assigns a `.rhai`; Enter submits; undo detaches |
+| Open script in editor | `d08bee1` | ✏ Edit + Project-panel double-click; External Editor pref in Preferences; $EDITOR opens in a Terminal tab |
+| Native folder picker | `48003ff` | Browse… on New/Open Project — test on **both Wayland and Xorg**; UI keeps rendering while the dialog is up |
+| File explorer | `c47efa8` | Breadcrumbs, New Folder, rename/delete menus, drag-to-move, OS drag-in import, double-click open |
+
+Engine-side groundwork already on `main`: `AssetDatabase::move_asset`/
+`move_folder`/`delete_asset` (uid-preserving, so renames/moves never break a
+saved `AssetRef`), whole-tree `scan`, `editor/src/assets.rs` script
+template/creation helpers, `editor/src/explorer.rs` (unit-tested behavior
+layer). Note: the build machine's toolchain is Rust 1.97 (rustup, user-local
+`~/.cargo/bin` — may need `export PATH="$HOME/.cargo/bin:$PATH"`).
+
+**Historical notes (already on `main` before this batch):**
+
 **1. Richer script API — ✅ DONE, on `main`.** Scripts now `spawn_entity()` /
 `spawn_entity(name)`, `despawn(e)`, and `add_component`/`set_component`/
 `remove_component` on any entity, plus `entity()` for their own. Implemented as a
@@ -206,9 +239,10 @@ reserved word, hence the longer name). Component edits go through RON, closing t
 last PLAN round-trip criterion. Headless tests in `host.rs`/`bridge.rs`; docs in
 `docs/scripting.md` ("Spawning entities and editing components").
 
-**2. Maintainer's editor-UX batch (GUI → `dev` + eye-check).** Details in
-PLAN.md "Editor-UX follow-ups" + [[editor-file-explorer-preference]]. The
-maintainer asked for these after the terminal work:
+**2. Maintainer's editor-UX batch — ✅ DONE 2026-07-10, on `dev` (see the
+table above; awaiting eye-check).** Original ask, for context — details in
+PLAN.md "Editor-UX follow-ups". The maintainer asked for these after the
+terminal work:
 - **"New Script" button** on the `Script` inspector — write a `.rhai` template
   into `assets/scripts/`, register it in the db, auto-assign it to the component.
   There is **no in-editor script creation today** (scripts are authored as