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-# RPN (Postfix Notation) Stack Calculator Implementation Plan
-
-## Context
-
-The `perc` project is a percentage calculator that currently supports three formats:
-- `20% of 150`
-- `30 is what % of 150`
-- `30 is 20% of what`
-
-Users want to extend it to support postfix notation (Reverse Polish Notation) stack-based calculations like `3 4 + 4 4 - *`, with variable assignments and reuse capabilities.
-
-## Requirements
-
-### Core Features
-- **Postfix Notation Parser**: Parse space-separated tokens where numbers are pushed to a stack and operators pop operands and push results
-- **Arithmetic Operations**: Addition (+), subtraction (-), multiplication (*), division (/), power (^), modulo (%)
-- **Variable Support**:
-  - Assign: `varname value =` stores value in variable
-  - Reuse: `varname` pushes stored value onto stack
-  - Delete: `varname d` removes variable
-  - List: `vars` shows all variables
-  - Clear: `clear` removes all variables
-- **Stack Inspection**: `dup` (duplicate top), `swap` (swap top two), `pop` (remove top), `show` (print stack)
-- **Error Handling**: Division by zero, invalid operators, insufficient operands, undefined variables
-- **Input Methods**: Support both `perc calc 3 4 +` and `perc rpn 3 4 +` syntax
-
-## Task Structure
-
-### Core Implementation (Tasks 401-403)
-| Task ID | Description | Dependencies |
-|---------|-------------|--------------|
-| 401 | Create `internal/rpn/variables.go` - Variable storage and management | None |
-| 402 | Create `internal/rpn/operations.go` - Operator implementations and stack manipulation | 401 |
-| 403 | Create `internal/rpn/rpn.go` - RPN parser and evaluator | 401, 402 |
-
-### Integration (Tasks 404-408)
-| Task ID | Description | Dependencies |
-|---------|-------------|--------------|
-| 404 | Add `ParseRPN()` to `internal/calculator/calculator.go` | 403 |
-| 405 | Update `cmd/perc/main.go` - Add calc/rpn subcommands | 404 |
-| 406 | Update `internal/repl/repl.go` - Handle RPN input | 405 |
-| 407 | Update `internal/repl/commands.go` - Add rpn command | 406 |
-| 408 | Update `Magefile.go` - Add RPN() target | 407 |
-
-## Implementation Approach
-
-### File Structure
-```
-internal/
-├── calculator/
-│   ├── calculator.go          # Existing - add RPN support
-│   └── calculator_test.go     # Add RPN tests
-├── rpn/
-│   ├── rpn.go                 # New: RPN parser and evaluator
-│   ├── operations.go          # New: Operator implementations
-│   └── variables.go           # New: Variable storage and management
-└── repl/
-    ├── repl.go                # Update to support RPN
-    └── commands.go            # Add rpn command
-
-cmd/perc/
-└── main.go                    # Add calc/rpn subcommand support
-```
-
-### Key Components
-
-**`internal/rpn/rpn.go`**:
-- `ParseAndEvaluate(input string) (string, error)` - Main entry point
-- Tokenize input into numbers, operators, variables
-- Execute RPN evaluation using stack
-
-**`internal/rpn/operations.go`**:
-- Operator functions: add, subtract, multiply, divide, power, modulo
-- Stack manipulation: dup, swap, pop, show
-- Error handling for invalid operations
-
-**`internal/rpn/variables.go`**:
-- Variable storage map
-- `SetVariable(name string, value float64)` - Assign: `name value =`
-- `GetVariable(name string)` - Retrieve variable value
-- `DeleteVariable(name string)` - Delete: `name d`
-- `ListVariables()` - List all: `vars`
-- `ClearVariables()` - Clear all: `clear`
-
-**`internal/calculator/calculator.go`**:
-- Add `ParseRPN(input string) (string, error)` function
-- Integrate with existing `Parse()` to detect RPN format
-
-**`cmd/perc/main.go`**:
-- Add `calc` and `rpn` subcommand support
-- Route to appropriate parser based on command
-
-**`internal/repl/repl.go`**:
-- Update executor to handle RPN input
-- Update commands.go to include `rpn` as built-in command
-
-**`Magefile.go`**:
-- Add `RPN()` target for testing
-
-## Usage Examples
-
-```bash
-# Basic arithmetic
-perc calc 3 4 +           # → 7
-perc calc 3 4 + 4 4 - *   # → 0
-
-# Power and modulo
-perc calc 2 3 ^           # → 8
-perc calc 10 3 %          # → 1
-
-# Variables
-perc calc x 5 = x x +     # → 10
-perc calc pi 3.14159 = pi 2 *   # → 6.28318
-
-# Stack operations
-perc calc 1 2 3 dup       # → 1 2 3 3
-perc calc 1 2 swap        # → 2 1
-perc calc 1 2 3 pop       # → 1 2
-
-# Variable management
-perc calc vars            # List all variables
-perc calc x d             # Delete variable x
-perc calc clear           # Clear all variables
-```
-
-## Testing Strategy
-
-### Unit Tests
-- Each operation function (add, sub, mul, div, pow, mod)
-- Variable operations (set, get, delete, list, clear)
-- RPN tokenization and evaluation
-
-### Integration Tests
-- Full RPN evaluation with mixed operations
-- Variable assignment and reuse
-- Error cases (division by zero, undefined variables, insufficient operands)
-
-### Manual Testing
-1. `perc calc 3 4 +` - should output `7`
-2. `perc calc 3 4 + 4 4 - *` - should output `0`
-3. `perc calc 2 3 ^` - should output `8`
-4. `perc calc x 5 = x x +` - should output `10`
-5. `perc calc vars` - should list variables
-6. `perc calc clear` - should clear all variables
-7. `mage rpn` - verify Mage integration
-
-## Task UUIDs for Reference
-
-| Task ID | UUID |
-|---------|------|
-| 401 | (see `task 401 _uuid`) |
-| 402 | (see `task 402 _uuid`) |
-| 403 | (see `task 403 _uuid`) |
-| 404 | (see `task 404 _uuid`) |
-| 405 | (see `task 405 _uuid`) |
-| 406 | (see `task 406 _uuid`) |
-| 407 | (see `task 407 _uuid`) |
-| 408 | (see `task 408 _uuid`) |