Publish versioned LAD22 and LAD23 local-authority lookups

[anth-volk]

Create complete, immutable LAD22 and LAD23 local-authority lookup CSVs while preserving the legacy local_authorities_2021.csv asset. Validate roster membership and display coordinates, and include both new files in the established private-data publication workflow.

[anth-volk]

Closed in favor of PolicyEngine/policyengine-sim-api#705. Stage 12 now packages these temporary display resources in the executor, so this repository does not need to publish new LAD lookup assets for the Stage 12 fix.

[anth-volk]

Update: the replacement simulation API work is now PolicyEngine/policyengine-sim-api#706. GitHub closed #705 when its branch was renamed.