docs: validate input-required wipe-cache responses

[mturac]

Fixes #2542.

Summary

• validate the wipe-cache confirmation and scope responses with schema-aware acceptedContent
• re-request the scope when client-provided scope content is missing or invalid
• remove the unsafe all fallback from the destructive example

Testing

• corepack pnpm sync:snippets --check
• corepack pnpm --filter @modelcontextprotocol/examples typecheck
• corepack pnpm --dir examples exec tsx guides/servers/input-required.examples.ts
• corepack pnpm --filter @modelcontextprotocol/examples lint
• git diff --check

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Latest commit: 3ce3386

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commit: 3ce3386