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reid-spencer 
Add root2Json — AST -> JSON serializer (inverse of parseJson)

Implements the symmetric inverse of parseJson as a plain recursive serializer
(JsonSerializer, the inverse of JsonAstBuilder), not a Pass — walks an AST.Root
to a JsonModel.RootDto, then upickle-writes it. Covers the full JSON subset
(definitions, type expressions, statements, functions/methods, interactions,
metadata); lossless for the documented subset and best-effort (non-crashing)
beyond it. Native-safe.

- riddlLib/shared/.../json/JsonSerializer.scala: the serializer.
- JsonModel.writeRoot(dto, indent): upickle write side (reuses the existing
  ReadWriters, so output is exactly what parseJson reads).
- RiddlLib.root2Json(root, pretty) (trait + companion); RiddlAPI.root2Json
  @JSExported; index.d.ts updated. Additive.
- Tests: parseJson -> root2Json -> parseJson preserves the error+warning
  profile and is stable/idempotent across the core DDD subset, the type-
  expression surface, streaming/integration, epics+interactions, and
  metadata/functions/sagas/modules. A JVM Root2JsonExamplesTest round-trips
  the 3 committed json-examples. JVM 63 + JS 33 green; Native compiles.

Design note: the requesting task proposed a JsonifyPass (HierarchyPass); the
plain recursive serializer was chosen instead (approved) as the true inverse
of the non-pass JsonAstBuilder — simpler, and guarantees schema symmetry.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Source Files on build 28550772676