docs: update README for default demo and command aliases

README.md

@@ -1,15 +1,16 @@
 # RPN Virtual Calculator
 
-A browser-friendly RPN calculator built around a small, generic JavaScript API.
+A browser-friendly RPN calculator built around a small JavaScript API.
 
 ## Overview
 
 This project provides:
 
 - a reusable JavaScript RPN engine in `src/rpn-calculator.js`
-- browser demos in `samples/dev/` and `samples/calc-02/`
-- a command system centralized in a single operation dictionary
-- a small public API focused on stack operations and generic command dispatch
+- a classic browser demo in `samples/dev/`
+- a portrait-first HP48GX-inspired demo in `samples/calc-02/`
+- a centralized command system with aliases
+- a compact public API focused on stack operations, editing, and command dispatch
 
 The main class is `RpnCalculator`.
 
@@ -19,9 +20,6 @@ The main class is `RpnCalculator`.
 - `samples/dev/index.html`: browser demo entry point
 - `samples/dev/index.css`: demo styles
 - `samples/dev/index.js`: demo UI and keyboard logic
-- `samples/calc-01/index.html`: active browser demo entry point
-- `samples/calc-01/index.css`: demo styles
-- `samples/calc-01/index.js`: demo UI and keyboard logic
 - `samples/calc-02/index.html`: portrait-first HP48GX-style demo entry point
 - `samples/calc-02/index.css`: portrait-first demo styles
 - `samples/calc-02/index.js`: portrait-first HP48GX-style demo UI and keyboard logic
@@ -68,10 +66,10 @@ State exposed on instances:
 
 ```js README.md
 const calc = new RpnCalculator({
-  maxSize: 2048,
-  base: 10,
-  angleMode: 'deg',
-  enabledCommands: ['add', 'sub', 'mul', 'div']
+	maxSize: 2048,
+	base: 10,
+	angleMode: 'deg',
+	enabledCommands: ['add', 'sub', 'mul', 'div']
 });
 ```
 
@@ -88,6 +86,9 @@ Available constants:
 
 - `pi`
 - `e`
+- `phi`
+- `g`
+- `c`
 - plus any user-defined constants added through the engine API
 
 They can be used through `command(...)`:
@@ -194,10 +195,10 @@ console.log(calc.pop()); // 5
 ```html README.md
 <script src="./src/rpn-calculator.js"></script>
 <script>
-  const calc = new RpnCalculator({ angleMode: 'deg' });
-  calc.push(9);
-  calc.command('sqrt');
-  console.log(calc.pop());
+	const calc = new RpnCalculator({ angleMode: 'deg' });
+	calc.push(9);
+	calc.command('sqrt');
+	console.log(calc.pop());
 </script>
 ```
 
@@ -239,7 +240,7 @@ console.log(calc.pop()); // 0.5
 
 ## Demo
 
-The active demo lives in `samples/dev/`.
+The default demo lives in `samples/dev/`.
 
 Main UI features:
 
@@ -249,7 +250,7 @@ Main UI features:
 - angle mode selector for `deg`, `rad`, and `grad`
 - status pills for `inputValue` and `isEditing`
 - grouped panels for `Stack`, `Arithmetic`, `Trigonometry`, and `Constants`
-- error display area
+- keyboard-friendly hidden input on desktop
 
 ## Calc 02 demo