feat: initialize governed datasources module

README.md

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+# govoplan-datasources
+
+<!-- govoplan-repository-type:start -->
+**Repository type:** module (platform).
+<!-- govoplan-repository-type:end -->
+
+`govoplan-datasources` is GovOPlaN's provider-neutral data access layer. It owns
+the tenant catalogue, lifecycle, staging, immutable materializations, frozen
+states, schema and fingerprint metadata, provenance, and bounded reads.
+
+The module deliberately separates two layers:
+
+- **Datasources** describe governed data that modules can consume consistently.
+- **Connectors** acquire data from external systems and expose provider origins.
+
+Dataflow, Workflow, Reporting, Risk Compliance, and other consumers depend on
+Datasource contracts rather than connector implementations.
+
+The first executable slice supports tabular static uploads, connector-backed
+live and cached sources, staging and promotion, refresh, immutable snapshots,
+explicit frozen states, previews, and retirement. The contracts already model
+database, HTTP/REST, directory, file, feed, document, binary, directory, and
+stream sources so providers can be added without changing consumers.
+
+See [docs/CONCEPT.md](docs/CONCEPT.md) for ownership and lifecycle details.