Fix CTAP2 test compile issues for jCardSim

[wl336]

Motivation

• The newly added CTAP2 credential tests introduced compilation failures due to references to symbols and APIs that were not available under the jCardSim/testing build.
• Ensure the authenticator code parses DH key agreement CBOR payloads using an in-scope key length value instead of relying on a variable out of scope.
• Avoid using ECKey.getSize() which is not present under the testing environment and instead use the compatible Key.getSize() API.

Description

• Added a local final short keyAgreementKeyLen = RESIDENT_KEY_CURVE_PARAMS.getKeyLength(); in consumeKeyAgreement to drive CBOR key parsing and avoid out-of-scope symbol errors in FIDO2Applet.
• Replaced the cast to ECKey with a cast to Key when calling getSize() in ensureCredentialKeyPair to be compatible with jCardSim.
• Included the large integration/unit test file src/test/java/us/q3q/fido2/AppletCtapCredentialTest.java that implements GetInfo, makeCredential, and getAssertion tests across ES256/ES384/ES512 and its lightweight CBOR/COSE helpers.

Testing

• Ran ./gradlew test --tests us.q3q.fido2.AppletCtapCredentialTest which compiled successfully and proceeded to run tests, but the run was interrupted before completion (execution did not finish).
• Verified that the previous compilation errors in FIDO2Applet are resolved by the code changes (no compilation failures reported during the test invocation).
• No new automated test failures were observed prior to the interrupted run.

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Codex Task

[wl336]

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