Add documentation and roadmap for a significant refactor around domain-focused module packages

docs/roadmap/future.md

@@ -4,6 +4,12 @@ Current Notarius behavior is documented in the canonical README, CLI,
 configuration, operations, internal, and integration docs. This roadmap records
 future work only.
 
+## Focused Roadmaps
+
+- [Domain-Typed Pipeline Implementation](domain.md): proposed migration to
+  domain-owned typed artifact lanes, domain-first packages, explicit
+  serialization boundaries, and bounded deterministic extract execution.
+
 ## Candidate Product Work
 
 - Additional input adapters, such as Markdown or note-export formats.
@@ -32,7 +38,6 @@ future work only.
   enforcement that a validator is suitable for a specific stage or module.
 - Batching or context-window controls for LLM-backed validators if validator
   inputs become large enough to require them.
-- Parallel execution where it preserves deterministic manifests and diagnostics.
 - Additional output encoders.
 
 ## Candidate Operational Work