feat: Validate CTAPHID response framing

[DennisDyallo]

Summary

• Validate CTAPHID response init and continuation channel IDs.
• Reject init packets in continuation position and malformed short init packets.
• Preserve seven-bit continuation sequence wrap semantics.

Verification

• dotnet toolchain.cs -- test --project Core --filter "FullyQualifiedName~FidoHidProtocolTests"
• dotnet toolchain.cs -- test --integration --project Fido2 --smoke --filter "Category!=RequiresUserPresence"
• Read-only review: no findings

[Copilot]

Pull request overview

This PR tightens CTAP HID response parsing in FidoHidProtocol by validating response framing (channel IDs, init/continuation packet type, and continuation sequence), and adds unit tests to exercise these framing validation paths.

Changes:

• Added validation for CTAP HID init response packets (minimum length, channel ID match, init bit set).
• Added validation for CTAP HID continuation packets (minimum length, channel ID match, init bit clear, expected sequence with 7-bit semantics).
• Introduced new unit tests covering channel/sequence mismatches, malformed short init packets, and init-vs-continuation framing errors.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Core/src/Protocols/Fido/Hid/FidoHidProtocol.cs	Adds init/continuation response framing validation and keep-alive handling adjustments during response receive.
src/Core/tests/Yubico.YubiKit.Core.UnitTests/Protocols/Fido/Hid/FidoHidProtocolTests.cs	Adds unit tests validating continuation sequence masking and various malformed/incorrect response framing cases.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.