[PULL REQUEST] Sort needed before integerize_1d function

[GregorSchroeder]

Describe this pull request. What changes are being made?

The integerize_1d function implemented in #98 with the "weighted_random" methodology requires the data to be explicitly sorted to avoid any issues with stochastic variation from run to run. This pull request adds explicit sorts before usage.

What issues does this pull request address?

closes #102

[Copilot]

Pull request overview

Adds explicit sorting before calling integerize_1d to make the weighted-random integerization deterministic and consistent across runs.

Changes:

• Sort intermediate demographic frames by race, sex, age before integerization in annual cycle calculations.
• Sort pop_df before integerizing population in the main pipeline.
• Minor formatting adjustments around round(...) calls.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
python/annual_cycle.py	Adds sort_values(["race","sex","age"]) ahead of integerization in births/deaths/migration/newborns flows.
main.py	Sorts pop_df in-place before integerize_population to stabilize row order.

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