feat: persist feature research and versioned alpha assessments

backend/app/research/features.py

@@ -0,0 +1,20 @@
+"""Feature plans remain versioned inputs to the shared template research path."""
+
+from fastapi import HTTPException
+
+from .assets import Assets
+from .workspace_contracts import AssetWrite
+
+
+class Features:
+    def __init__(self, db):
+        self.assets = Assets(db)
+
+    async def to_template(self, asset_id, version):
+        feature = await self.assets.get(asset_id, version, "feature")
+        if not feature["content"].get("template"):
+            raise HTTPException(422, "特征方案尚未定义输出模板")
+        return await self.assets.save(
+            AssetWrite(kind="template", content=feature["content"]["template"]),
+            provenance={"feature": feature},
+        )