Cover Draft 3 identifier nesting in the evaluator test suite

[Vansh-kap-98]

103 cases added to test/evaluator/evaluator_draft3.json, covering the identifier nesting shapes we had no coverage for:

• cycles across identifier scopes: mutual, three-scope, self-recursive, and one mixing a relative hop with an absolute return hop
• identifiers under disallow, extends, dependencies, additionalProperties and patternProperties rather than properties
• five-level chains alternating relative and absolute identifiers, where an absolute one mid-chain resets the base
• one target reached by two spellings, and the same anchor name declared in two resources
• $ref siblings, which Draft 3 ignores
• identifiers combined with type unions, including a union inside a union and an identifier on both the union and the keyword it distributes
  Plus regression cases for bugs found while writing these: the required marker, $ref siblings beside extends, and definitions relocated with a reference.

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[cubic-dev-ai]

No issues found across 1 file

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[jviotti]

I think it looks good!