feat: scaffold governed wiki module

AGENTS.md

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+# GovOPlaN Wiki Codex Guide
+
+## Scope
+
+This repository owns collaborative, revisioned Wiki spaces and pages.
+
+## Boundaries
+
+- Depend on kernel contracts from `govoplan-core` and access contracts from `govoplan-access`.
+- Keep page identity, revisions, links, labels, and publishing state here.
+- Store binary attachments through Files/DMS references rather than local blobs.
+- Keep formal records and legal retention in Records/DMS.
+- Integrate external wikis through connector capabilities and stable external references.
+- Do not import sibling module internals.
+
+## Local Workflow
+
+Use Gitea issues as the canonical backlog and state log.