Hardware layer: Add exponential backoff to auto-reconnect

[ng]

Background

Currently, HardwareClient.ensureConnected() will attempt to reconnect immediately when config.autoReconnect = true. If the hardware daemon is down, callers in retry loops (e.g., polling jobs) can hammer the socket path repeatedly.

Problem

• No delay between reconnection attempts
• No maximum retry limit
• Can overwhelm system resources if daemon is persistently unavailable
• Logs fill with connection errors

Proposed Solution

Add bounded retry logic with exponential backoff:

class HardwareClient {
  private reconnectAttempt = 0
  private lastReconnectTime = 0
  
  private async ensureConnected() {
    if (needs reconnect) {
      const now = Date.now()
      const backoff = Math.min(30000, 1000 * 2 ** this.reconnectAttempt)
      
      if (now - this.lastReconnectTime < backoff) {
        throw new HardwareError('Reconnect cooldown active')
      }
      
      this.reconnectAttempt++
      this.lastReconnectTime = now
      
      if (this.reconnectAttempt > 5) {
        throw new HardwareError('Max reconnect attempts exceeded')
      }
      
      await this.connect()
      this.reconnectAttempt = 0 // Reset on success
    }
  }
}

Configuration

Add to HardwareClientConfig:

• maxReconnectAttempts (default: 5)
• reconnectBackoffMs (default: 1000)
• maxBackoffMs (default: 30000)

Related

• CodeRabbit feedback from PR feat(hardware): add hardware abstraction layer #100 (nitpick comment ci: enable corepack in release gha #4)