feat: scaffold governed wiki module

docs/WIKI_DOMAIN_BOUNDARY.md

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+# Wiki Domain Boundary
+
+## Owns
+
+- tenant knowledge spaces
+- page identity, hierarchy, links, labels, and aliases
+- immutable page revisions and current revision selection
+- draft, review, published, archived, and redirected states
+- page-level access and publishing rules
+- references to attachments and related GovOPlaN resources
+
+## Does Not Own
+
+- binary storage or collaborative office-document editing
+- product and instance documentation, owned by Docs
+- formal records, legal holds, and retention
+- workflow execution, tasks, tickets, projects, or cases
+- external MediaWiki/BlueSpice transport
+
+## Integrations
+
+Files/DMS provides attachment references. Records can capture a published page
+revision as evidence. Search indexes only revisions the principal may
+discover. Projects, Tickets, and Cases may link pages as living knowledge.
+Connectors owns MediaWiki/BlueSpice discovery, synchronization, and migration.
+
+## First Slice
+
+Implement spaces, revisioned pages, links, access checks, and
+permission-aware search publication before adding rich editing or external
+synchronization.