feat(studies): use approval_at_optimal in Merrill tables 1/2/4 (split 3/3 of #56)

[endolith]

Split 3 of 3 from #56, per the plan in #80. Stacked on #82 (base: cursor/issue-10-simulation-api-44e5), sibling of #81 and #82.

Problem: merrill_1984_table_1_fig_1.py, merrill_1984_table_2.py, and merrill_1984_table_4.py still build ranked_methods/rated_methods from the shared merrill_1984_comparison_methods() helper, which hardcodes the Merrill method set.

Approach: define the method dicts locally in each table script, importing the methods directly and using the new public approval_at_optimal helper for the Approval entry — the same inline pattern already used by the _updated fig scripts (2c/2d, 4a/4b) and table 3. This removes the last hardcoded-Merrill dependency from the table scripts.

merrill_1984_comparison_methods stays in condorcet_metrics.py because the non-updated fig_2c_2d.py and fig_4a_4b.py still use it.

Commits:

• f8f4f8d feat(studies): define Merrill tables 1/2/4 methods locally with approval_at_optimal

— Skales

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