Implement Start Retry Logic with Configurable Attempts

[alexmond]

Feature Request: Start Retry Logic

Add configurable retry mechanism when process startup fails, matching supervisord's startretries functionality.

Requirements

• Add startretries field to ProcessConfig (default: 3)
• Add retryInterval field for delay between attempts
• Implement retry logic in ProcessManager.startProcess()
• Track retry attempts and give up after configured limit
• Emit events for retry attempts and final failure

Acceptance Criteria

• Failed process starts are retried up to configured limit
• Appropriate delays between retry attempts
• Events generated for each retry attempt
• After max retries, process marked as failed permanently