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-# RPN Virtual Calculator
-
-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`
-- 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`.
-
-## Project structure
-
-- `src/rpn-calculator.js`: calculator engine
-- `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-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
-- `samples/calc-XX/`: placeholder name for future demo variants
-
-## Public API
-
-The calculator API is centered on these methods:
-
-- `push(value)`
-- `pop()`
-- `clear()`
-- `swap(index1, index2)`
-- `remove(index)`
-- `edit(index)`
-- `isValidIndex(index)`
-- `input(command)`
-- `command(name, ...args)`
-
-Instance helpers also available:
-
-- `getOperationsByCategory()`
-- `getConstants()`
-- `listConstants()`
-- `setConstant(name, value)`
-- `removeConstant(name)`
-- `hasConstant(name)`
-
-Static helpers also available:
-
-- `RpnCalculator.getOperationCategories()`
-- `RpnCalculator.getOperationsByCategory()`
-
-State exposed on instances:
-
-- `inputValue` as a string
-- `isEditing` as a boolean
-- `stack` as the current internal stack array used by the demo
-- `angleMode`
-- `base`
-- `maxSize`
-
-## Constructor options
-
-```js README.md
-const calc = new RpnCalculator({
-	maxSize: 2048,
-	base: 10,
-	angleMode: 'deg',
-	enabledCommands: ['add', 'sub', 'mul', 'div']
-});
-```
-
-Supported options:
-
-- `maxSize`: maximum stack size, default `2048`
-- `base`: numeric base, default `10`, accepted range `2..16`
-- `angleMode`: `deg`, `rad`, or `grad`, default `deg`
-- `enabledCommands`: optional whitelist of enabled commands and aliases
-
-## Constants
-
-Available constants:
-
-- `pi`
-- `e`
-- `phi`
-- `g`
-- `c`
-- plus any user-defined constants added through the engine API
-
-They can be used through `command(...)`:
-
-```js README.md
-calc.command('pi');
-calc.command('e');
-```
-
-## Supported commands
-
-### Stack
-
-- `enter`
-- `dup`
-- `drop`
-- `swap`
-- `clear`
-
-### Arithmetic
-
-- `add` alias: `+`
-- `sub` alias: `-`
-- `mul` alias: `*`
-- `div` alias: `/`
-- `mod` alias: `%`
-- `pow` aliases: `^`, `y^x`
-- `root` aliases: `y√x`, `yroot`, `nroot`
-- `sqr`
-- `neg`
-- `sqrt` alias: `sqrt(x)`
-- `recip` alias: `1/x`
-- `log`
-- `ln`
-
-### Trigonometry
-
-- `sin`
-- `cos`
-- `tan`
-- `asin`
-- `acos`
-- `atan`
-
-## Behavior notes
-
-- `mod` is a percentage operator:
-  - `a b % => (a * b) / 100`
-- `pow` accepts aliases `^` and `y^x`
-- `sqrt` accepts alias `sqrt(x)`
-- `recip` accepts alias `1/x`
-- `div` and `recip` throw `Division by zero` when needed
-- `root` computes the y-th root as `x^(1/y)` and throws `Invalid input for root` for invalid inputs
-- `sqrt` throws `Invalid input for sqrt` for negative values
-- `asin` and `acos` throw explicit domain errors outside `[-1, 1]`
-- `log` throws `Invalid input for log` for values `<= 0`
-- `ln` throws `Invalid input for ln` for values `<= 0`
-- `log` uses `Math.log10`
-- `ln` uses `Math.log`
-- direct trigonometric functions convert input using `toRadians(...)`
-- inverse trigonometric functions convert results back using the current angle mode
-- `angleMode` supports `deg`, `rad`, and `grad`
-- formatted numeric values are rounded to 12 decimal places
-- `-0` is normalized to `0`
-- `inputValue` remains a string to preserve future non-decimal input support
-- base 10 input is parsed with `Number(...)`
-- non-decimal input currently uses `parseInt(..., base)`
-
-## Input handling
-
-`input(command)` supports two modes:
-
-- single-character editing input
-- command dispatch
-
-Accepted single-character editing input currently includes:
-
-- `0-9`
-- `A-F`
-- `a-f`
-- `+`
-- `-`
-- `.`
-
-Everything else is forwarded to `command(...)`.
-
-## Basic usage
-
-### CommonJS
-
-```js README.md
-const RpnCalculator = require('./src/rpn-calculator');
-
-const calc = new RpnCalculator();
-calc.push(2);
-calc.push(3);
-calc.command('add');
-
-console.log(calc.pop()); // 5
-```
-
-### Browser
-
-```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());
-</script>
-```
-
-### Editing values through `input(...)`
-
-```js README.md
-const calc = new RpnCalculator();
-
-calc.input('1');
-calc.input('2');
-calc.input('.');
-calc.input('5');
-calc.command('enter');
-
-console.log(calc.pop()); // 12.5
-```
-
-### Aliases
-
-```js README.md
-const calc = new RpnCalculator();
-calc.push(6);
-calc.push(7);
-calc.command('+');
-console.log(calc.pop()); // 13
-```
-
-### Constants and trigonometry
-
-```js README.md
-const calc = new RpnCalculator({ angleMode: 'deg' });
-calc.command('pi');
-console.log(calc.pop());
-
-calc.push(30);
-calc.command('sin');
-console.log(calc.pop()); // 0.5
-```
-
-## Demo
-
-The default demo lives in `samples/dev/`.
-
-Main UI features:
-
-- four visible stack lines
-- main display/status area
-- visible angle mode indicator
-- angle mode selector for `deg`, `rad`, and `grad`
-- status pills for `inputValue` and `isEditing`
-- grouped panels for `Stack`, `Arithmetic`, `Trigonometry`, and `Constants`
-- keyboard-friendly hidden input on desktop
-
-## Calc 02 demo
-
-`samples/calc-02/` is a portrait-first HP48GX-inspired demo.
-It keeps the display-adjacent button row aligned in four columns, uses compact popup menus for mode and constants, and supports clipboard paste plus the `y√x` root operation.
-
-The demo loads the engine from:
-
-```html README.md
-<script src="../../src/rpn-calculator.js"></script>
-```
-
-### Demo keyboard support
-
-The current demo supports:
-
-- digits and decimal point
-- numpad digits and numpad arithmetic keys
-- `Enter`
-- `Backspace`
-- `Delete`
-- `Escape`
-- `ArrowUp`, `ArrowDown`, `ArrowRight`
-- `+`, `-`, `*`, `/`, `%`, `^`
-- `q`, `n`, `r`, `i`, `g`, `l`, `s`, `c`, `S`, `C`
-- `x`, `y`, `z`, `t`
-
-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.
-
-## Exports
-
-`RpnCalculator` is exposed in both environments:
-
-- browser: `window.RpnCalculator`
-- CommonJS: `module.exports = RpnCalculator`