Facet label placement

Suggestion:

Plot.plot({
  fy: { axis: null },
  marks: [
    Plot.dot(weather, {
      x: "date",
      y: "precipitation",
      fy: "weather",
      stroke: "weather"
    }),
    Plot.text(
      weather,
      Plot.selectFirst({
        fy: "weather",
        text: "weather",
        frameAnchor: "top-right"
      })
    )
  ]
})

then use dx and dy to give more breathing room

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