test(gn-auth): authenticated data/authorisation structure and unknown-trait 404

Add two contract tests:

- data/authorisation with token: verify the response body contains an
  'authorisation' key with at least one item, confirming the response
  structure is the same as the no-token path.
- data/authorisation with token + unknown trait: verify NotFoundError
  (404) is raised regardless of whether a token is present — the
  resource lookup precedes the token check.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Reviewed-By: Frederick M. Muriithi <fredmanglis@gmail.com>

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