fix: conformance – explicit filter params and gsa_elibrary_contracts

[vdavez]

Changes

• Part A – Explicit filter parameters: Replaced **kwargs / **filters with explicit named parameters on seven list methods so the conformance checker no longer reports "relies on **kwargs for filters":

  • list_contracts – explicit params for award_date, fiscal_year, agencies, ordering, piid, pop dates, solicitation_identifier, plus aliases (keyword, naics_code, psc_code, recipient_name, recipient_uei, set_aside_type, sort, order). Kept filters: SearchFilters | dict for backward compatibility.
  • list_idvs – explicit params for all manifest filter_params (award_date, agencies, idv_type, naics, ordering, piid, psc, recipient, search, set_aside, uei, etc.).
  • list_entities – explicit params (cage_code, naics, name, psc, purpose_of_registration_code, socioeconomic, state, total_awards_obligated_*, uei, zip_code).
  • list_forecasts – explicit params (agency, award_date_, fiscal_year_, modified_*, naics_code, naics_starts_with, search, source_system, status).
  • list_grants – explicit params (agency, applicant_types, cfda_number, funding_, opportunity_number, posted_date_, response_date_*, search, status).
  • list_notices – explicit params (active, agency, naics, notice_type, posted_date_, psc, response_deadline_, search, set_aside, solicitation_number).
  • list_opportunities – explicit params (active, agency, first/last_notice_date_, naics, notice_type, place_of_performance, psc, response_deadline_, search, set_aside, solicitation_number).

• Part B – GSA eLibrary contracts: Implemented the missing gsa_elibrary_contracts resource:

  • New GsaElibraryContract model and ShapeConfig.GSA_ELIBRARY_CONTRACTS_MINIMAL.
  • Explicit schema in explicit_schemas.py (including nested idv and recipient).
  • list_gsa_elibrary_contracts() and get_gsa_elibrary_contract() in the client with filter params: contract_number, key, piid, schedule, search, sin, uei.
  • Conformance script: added gsa_elibrary_contracts → list_gsa_elibrary_contracts and GSA_ELIBRARY_CONTRACTS_MINIMAL to shape config entries.

• Conformance script: Added protests: None to RESOURCE_TO_METHOD for completeness (assistance/offices/protests left out of scope).

Why

• Satisfy filter/shape conformance: the checker expects list methods to expose manifest filter params as explicit arguments (no **kwargs), and expects gsa_elibrary_contracts to have an SDK method.
• Improves IDE autocomplete and type safety for filter parameters.
• Backward compatible: existing call sites using the same keyword names or list_contracts(filters=...) continue to work.

Testing

• uv run ruff format tango/ && uv run ruff check tango/ – pass on tango/.
• uv run pytest tests/ -m "not integration" – 237 passed, 1 skipped.
• Conformance: uv run python scripts/check_filter_shape_conformance.py --manifest …/tango/contracts/filter_shape_contract.json – 0 errors; only remaining warnings are out-of-scope resources (assistance, offices, protests).