feat: Add conversation_id filtering to message endpoints (#8324)

* feat: Add conversation_id filtering to message list and search endpoints

Add optional conversation_id parameter to filter messages by conversation:
- client.agents.messages.list
- client.messages.list
- client.messages.search

Changes:
- Added conversation_id field to MessageSearchRequest and SearchAllMessagesRequest schemas
- Added conversation_id filtering to list_messages in message_manager.py
- Updated get_agent_recall_async and get_all_messages_recall_async in server.py
- Added conversation_id query parameter to router endpoints
- Updated Turbopuffer client to support conversation_id filtering in searches

Fixes #8320

🤖 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Charles Packer <cpacker@users.noreply.github.com>

* add conversation_id to message and tpuf

* default messages filter for backward compatibility

* add test and auto gen

* fix integration test

* fix test

* update test

---------

Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
Co-authored-by: Charles Packer <cpacker@users.noreply.github.com>
Co-authored-by: christinatong01 <christina@letta.com>

letta/schemas/message.py

@@ -211,6 +211,7 @@ class Message(BaseMessage):
             tool_returns (List[ToolReturn]): The list of tool returns requested.
             group_id (str): The multi-agent group that the message was sent in.
             sender_id (str): The id of the sender of the message, can be an identity id or agent id.
+            conversation_id (str): The conversation this message belongs to.
     t
     """
 
@@ -237,6 +238,7 @@ class Message(BaseMessage):
     group_id: Optional[str] = Field(default=None, description="The multi-agent group that the message was sent in")
     sender_id: Optional[str] = Field(default=None, description="The id of the sender of the message, can be an identity id or agent id")
     batch_item_id: Optional[str] = Field(default=None, description="The id of the LLMBatchItem that this message is associated with")
+    conversation_id: Optional[str] = Field(default=None, description="The conversation this message belongs to")
     is_err: Optional[bool] = Field(
         default=None, description="Whether this message is part of an error step. Used only for debugging purposes."
     )
@@ -2302,6 +2304,7 @@ class MessageSearchRequest(BaseModel):
     agent_id: Optional[str] = Field(None, description="Filter messages by agent ID")
     project_id: Optional[str] = Field(None, description="Filter messages by project ID")
     template_id: Optional[str] = Field(None, description="Filter messages by template ID")
+    conversation_id: Optional[str] = Field(None, description="Filter messages by conversation ID")
     limit: int = Field(50, description="Maximum number of results to return", ge=1, le=100)
     start_date: Optional[datetime] = Field(None, description="Filter messages created after this date")
     end_date: Optional[datetime] = Field(None, description="Filter messages created on or before this date")
@@ -2311,6 +2314,7 @@ class SearchAllMessagesRequest(BaseModel):
     query: str = Field(..., description="Text query for full-text search")
     search_mode: Literal["vector", "fts", "hybrid"] = Field("hybrid", description="Search mode to use")
     agent_id: Optional[str] = Field(None, description="Filter messages by agent ID")
+    conversation_id: Optional[str] = Field(None, description="Filter messages by conversation ID")
     limit: int = Field(50, description="Maximum number of results to return", ge=1, le=100)
     start_date: Optional[datetime] = Field(None, description="Filter messages created after this date")
     end_date: Optional[datetime] = Field(None, description="Filter messages created on or before this date")