Adding a library drawing to a nest has several outcomes that must be decided
before anything changes, so the desktop can show warnings first and so every
rule is tested on Linux. `LibraryDrawingInsert.Plan` returns a new exact copy
carrying its library link, an added quantity on the copy already there, or a
refusal that leaves the nest untouched.
- Material, grade or thickness that differ from the nest still add the drawing
but drop its cut pins, with one warning naming each difference (D3). Names
compare by SharedListNames key and thickness at four decimals, matching the
server's own filters.
- Different units are refused: conversion is out of scope and a silent unit
mismatch would scale the part.
- The same revision from the same server only raises the quantity; a different
revision of that drawing is refused in favour of Update Drawings (D2b).
- Another drawing with the same name is refused naming both, because the
name-keyed DrawingCollection would otherwise drop one silently.
- A package whose hash or units disagree with its record is refused.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
