Document multi-objective LLaMEA options and example usage

[nikivanstein]

• Add missing documentation for the multi_objective mode so users understand how to enable Pareto-based optimization and how evaluators should return Fitness objects when using multiple objectives.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Fix multi_objective run command to include examples path

The new quickstart instruction python multi_objective.py is not runnable from the repository root, because the script lives under examples/multi_objective.py. Users following this section as written will get a file-not-found error and be blocked from running the documented workflow unless they infer an unstated cd examples step.

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