Revert "try to avoid persisting empty thinking/text blocks"

This reverts commit d8a15e7bc9.

packages/opencode/src/session/index.ts

@@ -342,23 +342,6 @@ export namespace Session {
     return part
   })
 
-  export const removePart = fn(
-    z.object({
-      sessionID: Identifier.schema("session"),
-      messageID: Identifier.schema("message"),
-      partID: Identifier.schema("part"),
-    }),
-    async (input) => {
-      await Storage.remove(["part", input.messageID, input.partID])
-      Bus.publish(MessageV2.Event.PartRemoved, {
-        sessionID: input.sessionID,
-        messageID: input.messageID,
-        partID: input.partID,
-      })
-      return input.partID
-    },
-  )
-
   export const getUsage = fn(
     z.object({
       model: z.custom<ModelsDev.Model>(),