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Groundwork for the Stage-10 editor-UX batch (file explorer, New Script button), all pure logic proven by unit tests: - `AssetDatabase::move_asset` / `move_folder` / `delete_asset`: perform the disk operation and the uid-map update together, so renaming or moving an asset (or a whole folder) keeps its uid and every saved `AssetRef` resolving. Kinds re-classify from the new path; `..` and existing destinations are refused via the new `AssetDbError` enum; deleted uids are never reused. - Editor `assets.rs`: `script_template` (compiles under the sandboxed ScriptEngine — covered by a test), `sanitize_script_stem`, and `create_script_file` which writes a collision-free `assets/scripts/<stem>.rhai` and returns the relative path for database registration. - docs/assets.md: new "File operations" section + the missing Script row in the typed-folder table. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>