Initialize project scaffold and domain model

TASKS.md

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+# TASKS
+
+## Current
+
+### `feat/domain-model`
+
+Status: completed
+
+DoD:
+
+- core domain types from `docs/data-model.md` exist
+- basic JSON and YAML serialization works
+- domain unit tests pass
+
+## Next
+
+### `feat/schema-engine`
+
+Status: pending
+
+DoD:
+
+- schema model exists
+- schema validation works
+- JSON sample normalization works
+
+### `feat/mapping-engine`
+
+Status: pending
+
+DoD:
+
+- JSONPath parsing works
+- input and output mapping work
+- draft generation from samples works
+
+## Backlog
+
+- `feat/registry-storage`
+- `feat/rest-vertical-slice`
+- `feat/admin-api-v1`
+- `feat/ui-v1`
+- `feat/mcp-server`
+- `feat/graphql-support`
+- `feat/grpc-support`