Register existing local taxes in the program coverage registry

[DTrim99]

What this does

First step of the local-tax build-out (see roadmap in the linked issue thread): registers the local taxes that are already modeled but were missing from the program coverage registry.

programs.yaml previously listed only 3 local entries (NYC income tax, SF WFTC, Montgomery County EITC), even though many local taxes are fully implemented. The model coverage page / /us/metadata therefore understated local coverage. This PR adds 10 entries:

Program	Variable	Coverage
Philadelphia wage tax	pa_philadelphia_wage_tax	Philadelphia, PA
Kansas City earnings tax	mo_kansas_city_earnings_tax	Kansas City, MO
St. Louis earnings tax	mo_st_louis_earnings_tax	St. Louis, MO
Indiana county income tax (LIT)	in_county_tax	All 92 IN counties
Maryland county income tax	md_local_income_tax_before_credits	All MD counties + Baltimore City
Multnomah Preschool for All	or_multnomah_pfa_tax	Multnomah County, OR
Denver occupational privilege	co_denver_employee_occupational_privilege_tax	Denver, CO
Glendale occupational privilege	co_glendale_employee_occupational_privilege_tax	Glendale, CO
Greenwood Village occupational privilege	co_greenwood_village_employee_occupational_privilege_tax	Greenwood Village, CO
Sheridan occupational privilege	co_sheridan_employee_occupational_privilege_tax	Sheridan, CO

Notes

• Metadata only — no calculation logic changes. Each entry references an existing household-facing variable (all verified present) and matches the existing nyc_income_tax entry schema.
• Investigated cleanup items that turned out to need no action: Aurora CO is not modeled (its OPT repeal needs no change); the Mamdani NYC proposal is correctly reform-only (not in baseline); MD/IN/Multnomah already have tests.
• Employer-side taxes (Seattle payroll, TriMet/Lane, NY MCTD, St. Louis payroll expense) are intentionally not registered as household taxes.
• Follow-ups in the roadmap: standardize the local-tax aggregation, and add small new taxes that fit existing geography (KY Louisville/Lexington, NY Yonkers, DE Wilmington).

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