ax(mining): replace prose comments with usage examples in simulated_miner.go

AX principle 2 — comments must show HOW (concrete call), not restate WHAT
the name already says. Three prose-style descriptions replaced with
realistic usage examples showing struct construction and registration.

Co-Authored-By: Charon <charon@lethean.io>

pkg/mining/simulated_miner.go

@@ -9,10 +9,10 @@ import (
 	"time"
 )
 
-// MinerTypeSimulated is the type identifier for simulated miners.
+// factory.Register(MinerTypeSimulated, func() Miner { return NewSimulatedMiner(SimulatedMinerConfig{}) })
 const MinerTypeSimulated = "simulated"
 
-// SimulatedMiner is a mock miner that generates realistic-looking stats for UI testing.
+// miner := &SimulatedMiner{Name: "sim-001", MinerType: MinerTypeSimulated, Algorithm: "rx/0"}
 type SimulatedMiner struct {
 	// Exported fields for JSON serialization
 	Name            string              `json:"name"`
@@ -42,7 +42,7 @@ type SimulatedMiner struct {
 	difficultyBase int
 }
 
-// SimulatedMinerConfig holds configuration for creating a simulated miner.
+// SimulatedMinerConfig{Name: "sim-001", Algorithm: "rx/0", BaseHashrate: 5000, Variance: 0.1}
 type SimulatedMinerConfig struct {
 	Name         string  // Miner instance name (e.g., "sim-xmrig-001")
 	Algorithm    string  // Algorithm name (e.g., "rx/0", "kawpow", "ethash")