docs(site): add cross-references to tools reference page

[github-actions]

Summary

Improved information scent in the tools reference page by adding cross-references to related concepts. The page previously mentioned AWF sandbox, MCPG, network allowlist, permissions.read, and clearMemory parameter without linking to their reference pages.

Changes

• Added link from "AWF sandbox" to network reference
• Added link from "clearMemory pipeline parameter" to parameters reference
• Added links from "MCPG" mentions to mcpg reference (2 occurrences)
• Added link from "permissions.read" to network reference (permissions section)
• Added link from "network allowlist" to network reference (2 occurrences)
• Added introductory sentence directing users to MCP reference for custom MCP servers

Accuracy checks

• All links point to existing pages in the site structure
• Link anchors verified against target pages (e.g., #permissions-ado-access-tokens exists in network.mdx)
• No behavioral claims added — changes are pure cross-referencing

Validation

• cd site && npm ci && npm run build
• Build succeeded with no errors
• Starlight links validator: "All internal links are valid."

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