[Task] patina_boot: Implement full ConsoleDiscovery (write ConIn/ConOut/ErrOut variables)

[kat-perez]

Description

Implement the full ConsoleDiscovery functionality to write ConIn, ConOut, and ErrOut UEFI variables as outlined in the Boot Orchestration RFC.

Current State

The current discover_console_devices() is a stub that only locates GOP and SimpleTextInput handles but does not write the console variables:

// Stub: Locate handles to verify protocols exist, but don't write variables.
// Full implementation would create multi-instance device paths and write
// ConIn/ConOut/ErrOut variables via runtime_services.set_variable().

Requirements

• Locate all GOP protocol handles and get their device paths
• Locate all SimpleTextInput protocol handles and get their device paths
• Create multi-instance device paths combining all console devices
• Write ConOut and ErrOut variables with GOP device paths
• Write ConIn variable with SimpleTextInput device paths
• Handle cases where no console devices are found

Related

• RFC: Boot Orchestration (RFC: Boot Orchestration Component #1013)
• Task: BootOptionDiscovery component ([Task] patina_boot: Implement BootOptionDiscovery component #1226)