* fix(contracts): drop nested defaults from a root union sibling
Flattening a union of strict object groups lifts each group's properties
into one object. A default the scenario group carried inside
normalization.rules survived that lift even though the passive group
declares no normalization, so a client that fills nested defaults sent
{normalization: {rules: []}} and the runtime parser refused the call
with "Unrecognized key: normalization".
Remove defaults below a property that any group omits, not just the one
on the property itself. A property every group owns keeps its own
nested guidance.
* fix(contracts): keep a nested default a reference still targets
Dropping the nested default of a property a sibling group omits also removed defaults that references point into. A resource whose validation $ref targets its own default was advertised with that reference intact but its target gone, so the advertised schema no longer compiled in AJV or client projection.
Collect the paths into a default that references inside the branch target and keep those entries while stripping the rest. Other nested defaults are still removed, so the strict sibling group keeps refusing the object.
* test(contracts): type the root union default regression fixture
The fixture spread the canonical branch through a widened cast, so the repository typecheck rejected the spread and indexed access. Narrow the branch shape and guard the optional schema before collecting its referenced defaults.
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Co-authored-by: 2SinceJuly <202121119+2SinceJuly@users.noreply.github.com>
