Convert confidential HTTP to DON mode

[vreff]

These changes are SDK-only. Capability changes are not required.

[changeset-bot]

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Latest commit: 64d967e

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[github-actions]

👋 vreff, thanks for creating this pull request!

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[github-actions]

The latest Buf updates on your PR. Results from workflow Regenerate Protobuf Files / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Feb 11, 2026, 3:58 PM