refactor: reorganize into monorepo with separate subprojects

Structure webber into three independent subprojects:
- webber-api/: FastAPI backend server with all agent code
- webber-cli/: Standalone CLI client (renamed from cli/ to webber_cli/)
- webber-sandbox/: Test project for functional testing

Key changes:
- Each subproject has its own .venv (Python 3.12+)
- Added sandbox.sh for managing test project templates
- Created sandbox-templates/ with calculator-cli and empty starter
- Updated CI/CD for prefixed tags (api/v*, cli/v*)
- Added comprehensive AGENTS.md with operational instructions
- Added gitignore filtering to glob and grep tools
- Created pyproject.toml for each subproject

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

webber-sandbox/.gitignore

@@ -0,0 +1,25 @@
+# Python
+__pycache__/
+*.py[cod]
+*.so
+.Python
+build/
+dist/
+*.egg-info/
+
+# Virtual environments
+.venv/
+venv/
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+
+# Project
+.current_template

webber-sandbox/TASKS.md

@@ -0,0 +1,64 @@
+# Calculator CLI - Tasks for Webber
+
+A simple calculator with intentional bugs and missing features for testing Webber's capabilities.
+
+## Bugs to Fix
+
+### High Priority
+- [ ] **Division by zero** - `operations.py:divide()` crashes when dividing by zero instead of returning an error
+- [ ] **Invalid operation name** - `main.py:get_operation()` raises KeyError for unknown operations instead of helpful error message
+
+### Medium Priority
+- [ ] **Power function broken** - `operations.py:power()` doesn't handle negative exponents or fractional exponents correctly
+- [ ] **No input validation** - `main.py` doesn't validate that command-line arguments are valid numbers
+
+## Missing Tests
+
+- [ ] Add `TestDivide` class with tests for:
+  - Normal division
+  - Division by zero (should test error handling once bug is fixed)
+  - Division with negative numbers
+
+- [ ] Add `TestPower` class with tests for:
+  - Positive integer exponents
+  - Zero exponent (should return 1)
+  - Negative exponents
+
+- [ ] Complete existing test classes:
+  - `test_add_zero`
+  - `test_add_floats`
+  - `test_subtract_negative`
+  - `test_multiply_by_zero`
+
+## Features to Add
+
+- [ ] **Expose power operation** - Add 'pow' to the operations dictionary in `main.py`
+- [ ] **Add modulo operation** - Implement `modulo(a, b)` in operations.py
+- [ ] **Add --verbose flag** - Show step-by-step calculation
+- [ ] **Add history command** - Track and display recent calculations
+- [ ] **Add REPL mode** - Interactive calculator loop
+
+## Code Quality
+
+- [ ] Add type hints to all functions
+- [ ] Add docstrings following Google style
+- [ ] Fix any linting errors (run `ruff check src/`)
+
+## How to Run
+
+```bash
+# Setup
+python3.12 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+
+# Run calculator
+python -m calculator.main 10 5 add
+python -m calculator.main 10 5 div
+
+# Run tests
+pytest tests/ -v
+
+# See failing tests (division by zero)
+python -m calculator.main 10 0 div
+```

webber-sandbox/pyproject.toml

@@ -0,0 +1,17 @@
+[project]
+name = "calculator"
+version = "0.1.0"
+description = "A simple calculator CLI with some bugs"
+requires-python = ">=3.12"
+
+[build-system]
+requires = ["setuptools>=75.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["src"]
+addopts = "-v"

webber-sandbox/requirements.txt

@@ -0,0 +1,2 @@
+# Calculator CLI dependencies
+pytest>=8.0.0

webber-sandbox/src/calculator/__init__.py

@@ -0,0 +1,3 @@
+"""Calculator CLI - A simple calculator with some bugs for testing."""
+
+__version__ = "0.1.0"

webber-sandbox/src/calculator/main.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+"""
+Calculator CLI - A simple command-line calculator.
+
+NOTE: This file contains intentional bugs for testing purposes.
+
+Usage:
+    python -m calculator.main 10 5 add
+    python -m calculator.main 10 5 sub
+    python -m calculator.main 10 5 mul
+    python -m calculator.main 10 5 div
+"""
+import sys
+
+from calculator.operations import add, subtract, multiply, divide
+
+
+def get_operation(op_name: str):
+    """
+    Get the operation function by name.
+
+    BUG: No validation - invalid operation names cause KeyError!
+    """
+    operations = {
+        "add": add,
+        "sub": subtract,
+        "mul": multiply,
+        "div": divide,
+        # BUG: 'power' is implemented in operations.py but not exposed here
+    }
+    # BUG: Should handle KeyError gracefully
+    return operations[op_name]
+
+
+def main():
+    """Main entry point."""
+    if len(sys.argv) != 4:
+        print("Usage: python -m calculator.main <a> <b> <operation>")
+        print("Operations: add, sub, mul, div")
+        sys.exit(1)
+
+    # BUG: No validation that a and b are valid numbers
+    a = float(sys.argv[1])
+    b = float(sys.argv[2])
+    op_name = sys.argv[3]
+
+    # BUG: This will crash with KeyError for invalid operation
+    operation = get_operation(op_name)
+    result = operation(a, b)
+
+    print(f"Result: {result}")
+
+
+if __name__ == "__main__":
+    main()

webber-sandbox/src/calculator/operations.py

@@ -0,0 +1,43 @@
+"""
+Math operations for the calculator.
+
+NOTE: This file contains intentional bugs for testing purposes.
+"""
+
+
+def add(a: float, b: float) -> float:
+    """Add two numbers."""
+    return a + b
+
+
+def subtract(a: float, b: float) -> float:
+    """Subtract b from a."""
+    return a - b
+
+
+def multiply(a: float, b: float) -> float:
+    """Multiply two numbers."""
+    return a * b
+
+
+def divide(a: float, b: float) -> float:
+    """
+    Divide a by b.
+
+    BUG: Does not handle division by zero!
+    """
+    # BUG: No check for b == 0
+    return a / b
+
+
+def power(a: float, b: float) -> float:
+    """
+    Raise a to the power of b.
+
+    BUG: Negative exponents not handled correctly for some cases.
+    """
+    # BUG: This naive implementation has issues with negative bases and fractional exponents
+    result = 1
+    for _ in range(int(b)):
+        result *= a
+    return result

webber-sandbox/tests/__init__.py

@@ -0,0 +1 @@
+"""Calculator tests."""

webber-sandbox/tests/test_operations.py

@@ -0,0 +1,46 @@
+"""
+Tests for calculator operations.
+
+NOTE: Test coverage is intentionally incomplete for testing purposes.
+"""
+import pytest
+
+from calculator.operations import add, subtract, multiply
+
+
+class TestAdd:
+    """Tests for add operation."""
+
+    def test_add_positive_numbers(self):
+        assert add(2, 3) == 5
+
+    def test_add_negative_numbers(self):
+        assert add(-2, -3) == -5
+
+    # MISSING: test_add_zero, test_add_floats
+
+
+class TestSubtract:
+    """Tests for subtract operation."""
+
+    def test_subtract_positive(self):
+        assert subtract(5, 3) == 2
+
+    # MISSING: test_subtract_negative, test_subtract_resulting_negative
+
+
+class TestMultiply:
+    """Tests for multiply operation."""
+
+    def test_multiply_positive(self):
+        assert multiply(3, 4) == 12
+
+    # MISSING: test_multiply_by_zero, test_multiply_negative
+
+
+# MISSING: TestDivide class entirely!
+# - test_divide_positive
+# - test_divide_by_zero (should test error handling)
+# - test_divide_negative
+
+# MISSING: TestPower class entirely!