docs(context): add documentation for

reme_ai/context/offload/context_compact.py

@@ -18,3 +18,27 @@ class ContextCompactOp(BaseAsyncOp):
 
         self.context["messages"] = messages
         self.context["offloaded_data"] = {"f": "ddd"}
+
+
+"""
+1. token counter 计数，最长上下文X20%=20K
+  1. openai  tiktoken / hagggingface / modelscope / rule-based
+          self.token_counter.count()
+2. tool:
+  1. dump_tool(write_file)
+  2. grep / rip_grep / read_file
+3. compact:
+  if > threashold(20K):
+    tool_call -> write_file
+  写一个引用：/xx/xxx/xxx.txt。是否保留前面的token（）
+4. compress:
+  1. prompt 
+  2. context -> write_file
+
+
+1. case study:
+2. messages
+  1. agentscope: reme
+  2. http远程 reme
+
+"""