P2-21 VirtualArduino PWM mapping for Uno + Mega

[Kinin-Code-Offical]

(Synced from docs/current_status/issue_ready_backlog.md)\n\n# P2-21 VirtualArduino PWM mapping for Uno + Mega\n\nSummary

• Area: FirmwareEngine VirtualMcu
• Deliverable: correct OCxA/OCxB mapping and behavior.

Acceptance Criteria

• Timer compare outputs map to correct pins for Uno + Mega.
• PWM duty cycle behavior matches expected semantics.

Test Plan

• Integration: PWM sketch; verify pin output waveform/duty cycle mapping.

Likely File Targets

• FirmwareEngine: FirmwareEngine/VirtualMcu.*

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[github-actions]

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