Add Zero Trust references (Access, Gateway, Devices, DLP)

[ruimarinho]

Summary

• Adds comprehensive Zero Trust (Cloudflare One) reference documentation
• Covers Access, Gateway, Devices (WARP), and DLP products
• Integrates with existing skill structure and decision trees

New References

access/ (7 files)

Identity-aware application access control:

• Applications (self-hosted, SaaS, infrastructure)
• Policies and groups
• Identity providers (Okta, Azure AD, SAML, OIDC)
• Service tokens for machine-to-machine auth

gateway/ (7 files)

Secure Web Gateway:

• DNS filtering policies
• HTTP/HTTPS inspection policies
• Custom allow/block lists
• Locations (DNS endpoints for offices)

devices/ (4 files)

Endpoint security with WARP:

• WARP client deployment
• Device posture checks
• MDM/EDR integrations (CrowdStrike, Intune, SentinelOne)

dlp/ (2 files)

Data Loss Prevention:

• Predefined and custom profiles
• Pattern matching (PII, credit cards, etc.)
• Datasets for exact-match detection

Changes to SKILL.md

• Updated description to include Zero Trust
• Added Zero Trust API authentication section
• Added "I need Zero Trust / secure access" decision tree
• Added Zero Trust product index section
• Added references for new products

Notes

• The existing tunnel/ reference is preserved - Zero Trust section links to it
• All API examples use curl with environment variables
• Includes Terraform examples where applicable
• Each product has gotchas.md for troubleshooting