feat: scaffold native projects module

docs/PROJECTS_DOMAIN_BOUNDARY.md

@@ -0,0 +1,31 @@
+# Projects Domain Boundary
+
+## Owns
+
+- portfolio and project identity
+- goals, status, dates, milestones, and project structure
+- participant and responsibility references
+- links to tasks, tickets, cases, files, Wiki pages, and calendar objects
+- project-level external references and synchronization provenance
+
+## Does Not Own
+
+- task execution or ticket queues
+- formal administrative case procedure
+- file storage or Wiki content
+- workflow runtime
+- OpenProject transport, credentials, or synchronization jobs
+
+## OpenProject Boundary
+
+Projects owns the native representation and decides which project concepts are
+meaningful inside GovOPlaN. Connectors owns OpenProject discovery, transport,
+mapping diagnostics, synchronization, and migration. A project may remain
+external-only, linked, partially synchronized, imported, or native according
+to the integration maturity level recorded on its external reference.
+
+## First Slice
+
+Implement project identity, status, milestones, participants, resource links,
+and canonical OpenProject reference mapping before implementing a full native
+work-package model.