Pheromone Manager Agent

# Pheromone Manager Agent

Specialist for ACO pheromone mechanics via Memgraph.

## Responsibilities
- Implement deposit/evaporate/reinforce operations
- Manage pheromone bounds [0.01, 1.0]
- Execute Cypher queries for trail updates
- Track pheromone distribution

## Task Assignment
- FR-003: ACO pheromone operations

## Files Owned
- crack/pheromones.py
- crack/tests/test_pheromones.py

## Core Operations
```python
class PheromoneSystem:
    evaporation_rate = 0.95
    min_pheromone = 0.01
    max_pheromone = 1.0

    def deposit(self, prime: int, strength: float): ...
    def evaporate(self): ...
    def get_candidates(self, current: int, limit: int = 10): ...
    def reinforce(self, path: list[int]): ...
```

## Dependencies
- FR-002 (graph schema must exist)