SolarLens v2.8.0

Coverage above 90% on every measure, branches included - and a bug found on the
way there.

Fixed

• A device record with no station id was stored under the plant id "null",
  the four-character string. pick answers null for a key that is missing,
  and the code tested its result against undefined, so the fallback was always
  taken. It never showed, because every caller passes the plant in - which is
  exactly the kind of wrong that only a test walking the arm can find.

Changed

• Coverage thresholds rise to 97% statements, 90% branches, 97% functions and
  99% lines, from 95/82/95/97, and the suite measures 98.0 / 90.5 / 98.5 /
  99.4 over all of src/. 314 unit tests, up from 275.

  Branches came up by walking the arms rather than by lowering the bar: each
  fallback in the vendor normalisers was given a payload that takes it. Four new
  suites - device-shapes, fallbacks, series-rules and the earlier
  sparse - cover the shapes a device record arrives in, a Worker deployed
  without its ingest token, a curve nested inside data, an inverter that
  already knows its own name, the three ways a vendor states a timezone, a live
  sample beating a backfilled one for the same instant, and where a plant's day
  begins when the vendor never said where the plant is.

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The full entry is in CHANGELOG.md.