docs: update calc-02 shortcut reference and key mappings

README.md

@@ -275,12 +275,15 @@ The current demo supports:
 - `Escape`
 - `ArrowUp`, `ArrowDown`, `ArrowRight`
 - `+`, `-`, `*`, `/`, `%`, `^`
-- `q`, `n`, `r`, `i`, `g`, `l`, `s`, `c`, `S`, `C`
-- `x`, `y`, `z`, `t`
+- `s`, `S`, `r`, `R`, `v`, `u`
+- `l`, `L`, `n`, `N`, `e`, `E`
+- `i`, `o`, `a`, `I`, `O`, `A`
 
 The demo also implements stack selection and stack-item move mode in its UI layer using the public calculator methods.
 It keeps the calculator screen focused and updates the visible stack window as the selection moves.
 
+Note: `calc-02` keyboard shortcuts are the reference for this project.
+
 ## Exports
 
 `RpnCalculator` is exposed in both environments: