docs(gateway): split configuration-reference by extracting agent-defaults cluster into config-agents

docs/concepts/messages.md

@@ -149,7 +149,7 @@ Outbound message formatting is centralized in `messages`:
 - `messages.responsePrefix`, `channels.<channel>.responsePrefix`, and `channels.<channel>.accounts.<id>.responsePrefix` (outbound prefix cascade), plus `channels.whatsapp.messagePrefix` (WhatsApp inbound prefix)
 - Reply threading via `replyToMode` and per-channel defaults
 
-Details: [Configuration](/gateway/configuration-reference#messages) and channel docs.
+Details: [Configuration](/gateway/config-agents#messages) and channel docs.
 
 ## Silent replies
 

docs/concepts/model-providers.md

@@ -630,5 +630,5 @@ See also: [/gateway/configuration](/gateway/configuration) for full configuratio
 
 - [Models](/concepts/models) — model configuration and aliases
 - [Model Failover](/concepts/model-failover) — fallback chains and retry behavior
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults) — model config keys
+- [Configuration Reference](/gateway/config-agents#agent-defaults) — model config keys
 - [Providers](/providers) — per-provider setup guides

docs/concepts/models.md

@@ -288,4 +288,4 @@ This applies whenever OpenClaw regenerates `models.json`, including command-driv
 - [Image Generation](/tools/image-generation) — image model configuration
 - [Music Generation](/tools/music-generation) — music model configuration
 - [Video Generation](/tools/video-generation) — video model configuration
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults) — model config keys
+- [Configuration Reference](/gateway/config-agents#agent-defaults) — model config keys