Default retrieval to 6 chunks instead of 2

chunks is a total per request, split across the attached sources, so an
agent with two sources and the default of 2 got a single chunk from each,
and its answers changed with whichever chunk won. 6 gives three per
source for about 4-5k more input tokens per retrieval turn.

Every literal default moves from 2 to 6: the request default, the
retrievers, the internal search tool, workflow agent nodes, scheduled and
headless runs, agent create/update/import, the source retrieval config and
the frontend forms. Existing agents and sources keep what they store; a
source saved with chunks=2 now counts as configured at 2, which is pinned
by a test.

Headless runs also read chunks=0 as unset (`or 2`), so an agent with
retrieval switched off retrieved anyway on scheduled runs; 0 now stays 0.

docsgpt/api/user/agents/portability.py

@@ -1552,9 +1552,9 @@ def apply_import(conn, user: str, doc: dict, resolution: Optional[dict] = None)
     slug = _unique_slug(agents_repo, user, metadata.get("slug") or spec.get("name"), exclude_id=exclude_id)
 
     try:
-        chunks_value = int(spec["chunks"]) if spec.get("chunks") is not None else 2
+        chunks_value = int(spec["chunks"]) if spec.get("chunks") is not None else 6
     except (TypeError, ValueError):
-        chunks_value = 2
+        chunks_value = 6
 
     # YAML-authoritative fields — written even when the resolved value is None,
     # so a re-import can CLEAR models / json_schema / prompt-to-default. On

docsgpt/api/user/agents/routes.py

@@ -259,7 +259,7 @@ def _format_agent_output(
         ),
         "source": source_value,
         "sources": sources_list,
-        "chunks": str(agent["chunks"]) if agent.get("chunks") is not None else "2",
+        "chunks": str(agent["chunks"]) if agent.get("chunks") is not None else "6",
         "retriever": agent.get("retriever", "") or "",
         "prompt_id": str(agent["prompt_id"]) if agent.get("prompt_id") else "",
         "tools": agent.get("tools", []) or [],
@@ -743,7 +743,7 @@ class CreateAgent(Resource):
                 # For classic agents: default chunks/retriever if nothing else supplied.
                 if agent_type != "workflow":
                     if build_data.get("chunks") in (None, ""):
-                        build_data["chunks"] = 2
+                        build_data["chunks"] = 6
                     if (
                         not source_id_resolved
                         and not extra_source_ids
@@ -989,7 +989,7 @@ class UpdateAgent(Resource):
                     elif field == "chunks":
                         chunks_value = data.get("chunks")
                         if chunks_value in ("", None):
-                            update_fields["chunks"] = 2
+                            update_fields["chunks"] = 6
                         else:
                             try:
                                 chunks_int = int(chunks_value)