fix(apple): preserve decoded keyed archive scalar identity

Move plist projection into the graph owner and identify generated scalar
wrappers by producer identity through every dictionary/UID consumer. Remove
the intermediate JSON clone that erased those facts. Literal wrapper-shaped
dictionaries remain dictionaries; scalar $top values fail as malformed.
Keep numeric projection after graph interpretation, preserve unknown counts,
and retain binary prototype-key partial facts with an explicit limitation.

Adapt @Jax367's relevant scalar proposal and public regression from PR #4317.
Add scalar-root, literal-root and binary prototype controls. Correct only
the captured Foundation data node expectation and its manifest digest;
original producer bytes and source are unchanged. Unrelated PR changes excluded.

Validation: 175 focused checks across 23 files pass, one skipped; build,
check:fast and docs:check pass. Public CLI and stdio MCP cover both encodings.
Baseline scalar controls fail; 24 tiny completed CLI cost comparisons retain
ordinary full replies and Evidence IDs byte for byte. No statistical speed
claim, heavy profiling, target execution or real deep-provider verification.

Fixes #4295
Fixes #4785

docs/native-investigation.md

@@ -324,6 +324,9 @@ complete observation.
   shared/cyclic references, class descriptors, raw serialized fields and
   malformed/unresolved/nil references. Missing fields stay absent; unknown
   classes are preserved. Select `root`, `offset` and `limit` explicitly.
+  Object `kind` describes the decoded archive value: data, dates and numbers
+  remain `scalar` when their JSON value uses a `$plist_type` wrapper. An actual
+  dictionary with the same fields remains `dictionary`.
   UID 0 cannot distinguish conditional nil from ordinary nil. Limits are
   64 MiB of input, 200,000 objects/references and 128 nesting levels.
   XML dictionary entries decoded as `__proto__` are omitted with an explicit