feat(federal-register): add the Federal Register documents resource

[makegov-mark]

What

Adds the Tango API's Federal Register resource (/api/federal_register/, API 5.3.0): rules, proposed rules, notices and presidential documents published since 1994.

• list_federal_register_documents() with all seventeen API filters as explicit named parameters: search, document_number, type, agency, fr_agency, publication_date_after/_before, effective_on_after/_before, comments_close_on_after/_before, comments_open, cfr_title, cfr_part, significant, rin, executive_order_number, plus ordering.
• get_federal_register_document(document_uuid) on the detail route, which takes the document's uuid. document_number alone is not unique, so lookups by number go through the list filter.
• FederalRegisterDocument schema (44 fields, all optional) and FEDERAL_REGISTER_MINIMAL / FEDERAL_REGISTER_COMPREHENSIVE defaults, matching the API's own list and retrieve defaults.
• full_text is shapeable on the detail method only and is left out of both defaults, since it can run to several MB.
• create_webhook_alert docs now list federal_register as a query_type, and docs/WEBHOOKS.md lists alerts.federal_register.match.
• API reference section, ShapeConfig table rows, and a CHANGELOG entry under Unreleased.

Other 5.3.0 additions

• agency filter (organization subtree, | for OR) on list_budget_accounts(), list_exclusions() and list_itdashboard_investments().
• The organization expand (agency_code, agency_name, department_code, department_name, office_code, office_name, organization_id) is accepted on budget accounts, exclusions, SBIR topics and SBIR solicitations, plus organization_id on budget accounts and exclusions. These come from regenerating tango/shapes/generated_overlay.py against the refreshed contract; the regeneration touched only those four resources. Default shapes are unchanged.
• The list_itdashboard_investments() tier notes now match the API: agency_name and agency are available at every plan.

Contract refresh

The vendored contracts/filter_shape_contract.json is refreshed to API 5.3.0.
With the additions above, the SDK covers everything that refresh surfaced: conformance_baseline.json is unchanged from main, and shape_coverage_baseline.json only drops federal_register.

Testing

• uv run pytest: 554 passed, 31 skipped (new tests/test_federal_register.py and tests/test_organization_scope.py).
• ruff format --check, ruff check, mypy tango/: clean.
• check_filter_shape_conformance.py: no errors. check_shape_coverage.py: no new drift.
• Exercised the Federal Register list, detail and full_text shapes, the three agency filters, and the organization expand on all four resources against the live API.

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