P2-22 VirtualArduino external interrupt modes (edge/level)

[Kinin-Code-Offical]

(Synced from docs/current_status/issue_ready_backlog.md)\n\n# P2-22 VirtualArduino external interrupt modes (edge/level)\n\nSummary

• Area: FirmwareEngine VirtualMcu
• Deliverable: EICRA/EICRB mode correctness.

Acceptance Criteria

• Rising/falling/low-level external interrupt modes behave correctly.
• Mode changes at runtime are handled.

Test Plan

• Integration: sketch that toggles interrupt modes and logs triggers.

Likely File Targets

• FirmwareEngine: FirmwareEngine/VirtualMcu.*

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[github-actions]

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