Restore compact budget-window results

[anth-volk]

Fixes #489

Summary

• Restore budget-window completed results to the compact post-Fix budget-window batch worker gateway imports #477 response shape: annualImpacts plus fiscal totals.
• Remove the full per-year macro output container from budget-window responses so completed runs no longer return massive outputsByYear payloads.
• Keep the retained runtime/data upgrade layer on top of the Fix budget-window batch worker gateway imports #477 behavior: country package pins, resolved core package, US data aliases, Modal data secret, and deployed US/UK version plumbing.

Verification

• uv run pytest tests/test_budget_window_results.py tests/test_budget_window_batch.py tests/test_budget_window_scheduler.py tests/gateway/test_models.py tests/gateway/test_budget_window_state.py tests/gateway/test_endpoints.py tests/test_modal_scripts.py -q
• ./scripts/generate-clients.sh
• uv run ruff check src/modal/budget_window_results.py src/modal/budget_window_scheduler.py src/modal/budget_window_state.py src/modal/gateway/models.py src/modal/gateway/responses.py fixtures/gateway/test_endpoints.py tests/gateway/test_budget_window_state.py tests/gateway/test_endpoints.py tests/gateway/test_models.py tests/test_budget_window_batch.py tests/test_budget_window_results.py tests/test_budget_window_scheduler.py tests/test_modal_scripts.py ../policyengine-apis-integ/tests/simulation/test_budget_window.py ../policyengine-apis-integ/tests/simulation/test_calculate.py
• uv run ruff check ../policyengine-apis-integ/tests/simulation/conftest.py
• git diff --check --cached