Address #128 review: doc lines and an exact position assertion

Co-Authored-By: Claude Fable 5 <[email protected]>

internal/service/ops.go

@@ -605,17 +605,16 @@ type DescribeGroup struct {
 	// DaysToMaturity is the plant's, when the catalog knows it — with PlantedAt,
 	// enough to say when the harvest is due.
 	DaysToMaturity *int `json:"daysToMaturity,omitempty"`
-	// Each lists the plops individually (id, version, location) only when the
-	// group has at most maxListedPlops of them.
+	// Each lists the plops individually (id, version, position, location) only
+	// when the group has at most maxListedPlops of them.
 	Each []DescribePlanting `json:"each,omitempty"`
 }
 
 // DescribePlanting is one plop with its position and a rough compass location.
 // ID + Version let an agent address a single plop — remove it or move it — the
-// same way DescribeObject.Version lets it edit an object; XCM/YCM (the object's
-// local frame) let a move keep the layout the plops had, which "north, south"
-// alone cannot: asked to move four tomatoes in a column "keeping the same
-// spacing", the live assistant re-laid them as two pairs for want of these.
+// same way DescribeObject.Version lets it edit an object. XCM/YCM are in the
+// object's local frame: they are what lets a move keep the layout the plops
+// had, which the compass word alone ("north", "south") cannot.
 type DescribePlanting struct {
 	ID        int64   `json:"id"`
 	Version   int64   `json:"version"`