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

docs/tools/image-generation.md

@@ -305,5 +305,5 @@ cross-provider `image_generate` contract.
 - [OpenAI](/providers/openai) — OpenAI Images provider setup
 - [Vydra](/providers/vydra) — Vydra image, video, and speech setup
 - [xAI](/providers/xai) — Grok image, video, search, code execution, and TTS setup
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults) — `imageGenerationModel` config
+- [Configuration Reference](/gateway/config-agents#agent-defaults) — `imageGenerationModel` config
 - [Models](/concepts/models) — model configuration and failover

docs/tools/multi-agent-sandbox-tools.md

@@ -369,5 +369,5 @@ After configuring multi-agent sandbox and tools:
 - [Sandbox vs Tool Policy vs Elevated](/gateway/sandbox-vs-tool-policy-vs-elevated) -- debugging "why is this blocked?"
 - [Elevated Mode](/tools/elevated)
 - [Multi-Agent Routing](/concepts/multi-agent)
-- [Sandbox Configuration](/gateway/configuration-reference#agentsdefaultssandbox)
+- [Sandbox Configuration](/gateway/config-agents#agentsdefaultssandbox)
 - [Session Management](/concepts/session)

docs/tools/music-generation.md

@@ -283,7 +283,7 @@ sections are configured.
 ## Related
 
 - [Background Tasks](/automation/tasks) - task tracking for detached `music_generate` runs
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults) - `musicGenerationModel` config
+- [Configuration Reference](/gateway/config-agents#agent-defaults) - `musicGenerationModel` config
 - [ComfyUI](/providers/comfy)
 - [Google (Gemini)](/providers/google)
 - [MiniMax](/providers/minimax)

docs/tools/pdf.md

@@ -188,4 +188,4 @@ Page-filtered fallback model:
 ## Related
 
 - [Tools Overview](/tools) — all available agent tools
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults) — pdfMaxBytesMb and pdfMaxPages config
+- [Configuration Reference](/gateway/config-agents#agent-defaults) — pdfMaxBytesMb and pdfMaxPages config

docs/tools/video-generation.md

@@ -437,5 +437,5 @@ openclaw config set agents.defaults.videoGenerationModel.primary "qwen/wan2.6-t2
 - [Together AI](/providers/together)
 - [Vydra](/providers/vydra)
 - [xAI](/providers/xai)
-- [Configuration Reference](/gateway/configuration-reference#agent-defaults)
+- [Configuration Reference](/gateway/config-agents#agent-defaults)
 - [Models](/concepts/models)