fixing presentation errors for re-delegated credentials

[maycon-mello]

No description provided.

[Copilot]

Pull request overview

Fixes verifiable presentation generation issues when working with re-delegated credentials by tightening BBS+ credential detection and ensuring signed presentations are returned as plain JSON (avoiding class-instance serialization pitfalls). Adds an integration test and fixture to reproduce the delegated-credential flow.

Changes:

• Update isBBSPlusCredential to rely on proof.type (instead of @context) to avoid misclassifying non-BBS credentials that include BBS-related contexts.
• Normalize presentation creation to return signed.toJSON() after signing.
• Add an integration test + delegated credential fixture to cover the delegated verification flow.

Reviewed changes

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

File	Description
packages/wasm/src/services/credential/service.ts	Adjusts BBS+ detection and returns signed presentations as JSON to prevent presentation serialization/format errors.
integration-tests/verification-flow/delegatable-verification.test.ts	Adds an integration test covering default presentation creation for a delegated credential.
integration-tests/data/default-presentation-tests/delegated-credential.json	Adds a delegated credential fixture used by the new integration test.

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