Document vault credential use with WebMCP tools

[rgarcia]

summary

• explain how ready credential items bind fields to live WebMCP tool inputs without placing values in public input
• note that, unlike fill, a WebMCP tool may submit or have other side effects
• add a tip to the WebMCP invoke section linking to the credential flow

validation

• npx -y mint@4.2.930 broken-links (passed)
• git diff --check (passed)

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