Split voting methods into package modules

[fsargent]

Summary

• replace the monolithic vse_sim.methods module with a methods package
• place each public voting method in its own module
• preserve existing from vse_sim.methods import ... imports through package re-exports

Stack

Depends on #57. Retarget this PR to main after #57 merges.

Validation

• uv run python -m pytest (44 passed)
• trunk check

Summary by Sourcery

Split the monolithic voting methods module into a dedicated methods package while preserving the existing public API.

Enhancements:

• Introduce individual modules for each voting method (e.g., IRV, IRV Prime, V321, Schulze, Ranked Pairs, Mav/Mj, Score/SRV, IRNR, Plurality, Borda, Bullety Approval) under a new methods package.
• Add a package initializer that re-exports voting methods and helpers to maintain compatibility with existing vse_sim.methods imports.
• Remove the old single methods.py module in favor of the new package structure.

[sourcery-ai]

Reviewer's Guide

Refactors the monolithic vse_sim.methods module into a proper package, moving each voting method and helper into its own module while preserving the existing public API via package-level re-exports.

File-Level Changes

Change	Details	Files
Introduce dedicated modules for each voting method and helper function and wire them together via a methods package.	Move IRV implementation into a new Irv class module, keeping strategy and ballot helpers intact Extract MAV and Majority Judgment logic into separate Mav and Mj modules, including shared toVote helper Split out Borda-style ranked methods and shared fillPrefOrder/fillCands helpers into a standalone module Add modules for IRNR, IRV Prime, 3-2-1 (V321), Score/Score Runoff (Srv), Schulze, Ranked Pairs (Rp), Plurality, and BulletyApprovalWith, each encapsulating its respective voting logic and strategy helpers Create methods package init that re-exports all public voting classes and helpers to maintain from vse_sim.methods import ... compatibility Remove the old monolithic methods.py in favor of the new package structure	src/vse_sim/methods/irv.py src/vse_sim/methods/mav.py src/vse_sim/methods/v321.py src/vse_sim/methods/schulze.py src/vse_sim/methods/irv_prime.py src/vse_sim/methods/score.py src/vse_sim/methods/borda.py src/vse_sim/methods/irnr.py src/vse_sim/methods/mj.py src/vse_sim/methods/srv.py src/vse_sim/methods/bullety_approval.py src/vse_sim/methods/__init__.py src/vse_sim/methods/plurality.py src/vse_sim/methods/ranked_pairs.py src/vse_sim/methods.py

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