Isolation bridged

What it checks

You declare that two blocks must share no conductive path; the check walks the full conduction graph — nets plus every block's internal paths — and names the exact bridge if one exists.

Why it matters

Isolation is a safety and integrity boundary: mains from touchable circuits, a noisy motor domain from a precision sensor. One shared ground pin — the most common accident — silently removes the entire barrier while the optocoupler sits there looking reassuring.

How to fix it

Break the named path. Usually it's a shared ground or a debug connector that spans both domains; the message lists the hop-by-hop route so you can see exactly which wire to cut.

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