ShadowBody deserializes with five required fields, so a model omitting
just spread lost the entire node — and every child line that named it as
a parent cascaded into 'Insert parent not found' (a measured 19-line,
whole-card silent loss). Effects are now normalized before the strict
parse: identity defaults for offsets/blur/spread, alias folding for the
common synonyms, a lone effect object wrapped into the array, numeric
strings coerced, and glow/drop-shadow spellings canonicalized. Truly
unknown effect kinds still fail the node — inventing an effect the model
did not ask for would be worse than dropping one. The modify path's
parser reuses the same normalizer so the two lanes cannot drift.
Claude-Session: https://claude.ai/code/session_01FqKQqNj8exYwopGDpYUU7x
2ca873346c