refactor(envelope): drop the reply counter and the injects line, keep time and vault changes

src/beaver_gateway/core/conversations.py

@@ -591,8 +591,6 @@ class Conversations:
             raise ValueError(msg)
         if agent is None and kind == "branch" and parent is not None:
             agent = parent.agent_name
-        if kind == "branch" and parent is not None and parent.kind == "master":
-            await self.set_flags(parent, {"streak": 0})
         agent = agent or self.default_agent(kind)
         if agent is None:
             msg = f"no default agent for kind {kind!r}; pass `agent`"
@@ -1291,7 +1289,7 @@ class Conversations:
         if head.priority == "user":
             origin = "user"
             prompt = head.text
-            envelope = await self._envelope_for(conv, injects=len(batch) - 1)
+            envelope = self._envelope_for(conv)
             if envelope:
                 prompt += "\n\n" + envelope
             if len(batch) > 1:
@@ -1326,14 +1324,10 @@ class Conversations:
                 text=text,
             )
 
-    async def _envelope_for(self, conv: Conversation, *, injects: int) -> str | None:
-        if conv.kind != "master":
+    def _envelope_for(self, conv: Conversation) -> str | None:
+        if conv.kind != "master" or self._envelope is None:
             return None
-        streak = int(conv.flags.get("streak", 0) or 0)
-        await self.set_flags(conv, {"streak": streak + 1})
-        if self._envelope is None:
-            return None
-        return self._envelope.build(streak=streak, injects=injects)
+        return self._envelope.build()
 
     def _observer(
         self, conv: Conversation, runner: _Runner, turn_id: str, origin: str