Initial commit: Python SDK for Dragonchain (Prime)

Synchronous Python SDK modeled on prime-sdk-go. Provides DC1-HMAC-SHA256
auth, dataclass models, and resource clients for system, transaction,
transaction-type, smart-contract, and block endpoints, plus a YAML
credentials loader.

prime_sdk/contract.py

@@ -0,0 +1,49 @@
+"""Smart-contract endpoints."""
+
+from .client import CONTENT_TYPE_JSON, Client
+from .models import (
+    ListResponse,
+    SmartContract,
+    SmartContractCreateRequest,
+    SmartContractUpdateRequest,
+    SuccessResponse,
+)
+
+
+class ContractClient:
+    def __init__(self, client: Client):
+        self._client = client
+
+    def create(self, req: SmartContractCreateRequest) -> SmartContract:
+        return self._client.post(
+            "/api/v1/contract", CONTENT_TYPE_JSON, req, SmartContract
+        )
+
+    def get(self, contract_id: str) -> SmartContract:
+        return self._client.get(f"/api/v1/contract/{contract_id}", SmartContract)
+
+    def list(self) -> ListResponse:
+        return self._client.get("/api/v1/contract", ListResponse)
+
+    def update(
+        self, contract_id: str, req: SmartContractUpdateRequest
+    ) -> SuccessResponse:
+        return self._client.put(
+            f"/api/v1/contract/{contract_id}", CONTENT_TYPE_JSON, req, SuccessResponse
+        )
+
+    def upload(self, contract_id: str, filepath: str) -> SuccessResponse:
+        """Upload smart-contract code from a local file (raw octet-stream body)."""
+        with open(filepath, "rb") as f:
+            file_content = f.read()
+        return self._client.put(
+            f"/api/v1/contract/{contract_id}/upload",
+            "application/octet-stream",
+            file_content,
+            SuccessResponse,
+        )
+
+    def delete(self, contract_id: str) -> SuccessResponse:
+        return self._client.delete(
+            f"/api/v1/contract/{contract_id}", SuccessResponse
+        )