Engine: open a design a feature at a time (#10198) (#10274)

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OpenSteps splits doc.open of a design into steps for a caller that must
keep working meanwhile (the web app, which has one thread): start reads
the file, each step evaluates the next feature by moving a copy's history
marker one feature on (so every result before it is reused), and finish
puts the design in the session's place with doc.open's reply. The next
feature's imported STEP text is offered first, so a caller can read it
in parts. Session::opened and opened_at are split into small helpers so
both paths build the session the same way; doc.open is unchanged.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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kaltenbrunnermarkus

2026-11-01 03:39:22 +00:00

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