ad_event :: a shared event format for ad and client programs

Example Format

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#!/usr/bin/env sh

9p read ad/buffers/1/event | while read -r line; do
    echo "got event: $line"
    txt=$(echo "$line" | sed 's/.*| //')
    if [ "$txt" = "README.md" ]; then
        echo "  > allowing event"
        echo "$line" | 9p write ad/buffers/1/event
    else
        echo "  > suppressing event"
    fi
done