`envelope new` sealed the `--microjoules` figure as JouleCost::measured.
The CLI runs no work a meter could read, so that figure is the issuer's
claim; sealing it as a hardware measurement put a reading nobody took into
the byte. It is now sealed as an estimate, with a test that a round-tripped
byte carries no measured figure whatever the command line gives.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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