feat(aigw): AI Custom Guardrail Policy overview migrate

[cloudjumpercat]

Description

TODO: fix diagram with AI Gateway (waiting on Greg for where this will move)

Preview Links

https://deploy-preview-5781--kongdeveloper.netlify.app/ai-gateway/policies/ai-custom-guardrail/

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

[netlify]

✅ Deploy Preview for kongdeveloper ready!

Name	Link
🔨 Latest commit	150075f
🔍 Latest deploy log	https://app.netlify.com/projects/kongdeveloper/deploys/6a557484aa210c000893c62d
😎 Deploy Preview	https://deploy-preview-5781--kongdeveloper.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[cloudjumpercat]

This is pending Greg's feedback!

Suggested change

	sequenceDiagram
	autonumber
	participant client as Client
	participant custguardrail as AI Custom Guardrail Policy
	participant guardrail as Guardrail service
	participant proxy as AI Proxy/Advanced plugin
	participant llm as Upstream AI service
	client->>custguardrail:Send request
	custguardrail<<->>guardrail:Intercept & send request body
	guardrail->>guardrail:Check against moderation <br>categories and blocklists
	guardrail->>custguardrail: Allow or block request
	custguardrail->>proxy: Forward allowed request
	proxy->>llm: Process allowed request
	llm->>proxy: Return AI response
	proxy->>custguardrail: Forward response
	custguardrail->>guardrail: Intercept & send response body
	guardrail->>guardrail: Check against moderation <br>categories and blocklists
	guardrail->>custguardrail: Allow or block response
	custguardrail->>client: Forward allowed response
	sequenceDiagram
	autonumber
	participant Client
	participant Gateway as {{site.ai_gateway}}
	participant Policy as AI Custom Guardrail Policy
	participant Guardrail as Guardrail service
	participant AI as Upstream AI Service
	Client->>Gateway: Send request
	Gateway->>Policy: Route request
	Policy->>Guardrail: Intercept & send request body
	Guardrail->>Guardrail: Check against moderation <br>categories and blocklists
	Guardrail->>Policy: Allow or block request
	Policy->>Gateway: Forward allowed request
	Gateway->>AI: Process allowed request
	AI->>Gateway: Return AI response
	Gateway->>Policy: Forward response
	Policy->>Guardrail: Intercept & send response body
	Guardrail->>Guardrail: Check against moderation <br>categories and blocklists
	Guardrail->>Policy: Allow or block response
	Policy->>Gateway: Forward allowed response
	Gateway->>Client: Forward allowed response to client

[Copilot]

Pull request overview

Updates the AI Custom Guardrail Policy overview page as part of the AI Gateway policy documentation migration, switching the page to the policy content type and adding end-user conceptual/configuration guidance.

Changes:

• Change frontmatter content_type from plugin to policy.
• Add an overview explaining how the policy inspects requests/responses and integrates with HTTP guardrail services.
• Add configuration guidance for config.params, request/response handling, and metrics.