Initialize governed Dataflow module

AGENTS.md

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+# GovOPlaN Dataflow Codex Guide
+
+## Scope
+
+This repository owns canonical pipeline definitions, immutable revisions,
+validation, constrained SQL compilation, preview and run diagnostics, and
+lineage references.
+
+Keep external connection profiles and credentials in `govoplan-connectors`,
+analytical presentation in `govoplan-reporting`, process orchestration in
+`govoplan-workflow`, and sanctions review semantics in
+`govoplan-risk-compliance`.
+
+## Working Rules
+
+- Never pass user-entered SQL directly to a database.
+- Keep previews bounded by rows, bytes, nodes, and execution time.
+- Do not persist preview row contents unless a future explicit retention policy
+  requires it.
+- Optional module integrations use manifest interfaces and capabilities, not
+  direct imports.
+- Gitea issues are the canonical backlog and implementation state.