feat: scaffold native projects module

AGENTS.md

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+# GovOPlaN Projects Codex Guide
+
+## Scope
+
+This repository owns native projects, portfolios, milestones, participation,
+status, and project-level resource links.
+
+## Boundaries
+
+- Depend on kernel contracts from `govoplan-core` and access contracts from `govoplan-access`.
+- Projects coordinates outcomes and work structure; Tasks and Tickets own actionable work-item semantics.
+- Cases own formal administrative procedures.
+- OpenProject transport and synchronization belong in Connectors.
+- Store external links through the canonical external-reference contract.
+- Do not import sibling module internals.
+
+## Local Workflow
+
+Use Gitea issues as the canonical backlog and state log.