Fix compilation errors from Swift Testing conversion

- Fixed ErrorRecoveryService.swift: Corrected RetryManager.execute() call
  to use named parameter onRetry instead of trailing closure
- Fixed ClaudeMonitorService.swift: Changed var to let for immutable status variable
- Resolved SwiftLint warnings about unused variables

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: steipete

Features/Monitoring/Domain/Services/ClaudeMonitorService.swift

@@ -191,7 +191,7 @@ public final class ClaudeMonitorService: ObservableObject {
                         let folderName = URL(fileURLWithPath: workingDir).lastPathComponent
 
                         // Extract more info from args if possible
-                        var status: String? = if argsString.contains("claude code") || argsString
+                        let status: String? = if argsString.contains("claude code") || argsString
                             .contains("--dangerously-skip-permissions")
                         {
                             "Claude Code"