feat: create native smoke window handles

fixtures/acceptance/coverage.tsv

@@ -29,6 +29,7 @@ S0-CLI-002	covered	cargo test -p fparkan-cli --offline accepts_json_format_optio
 S0-PLAT-001	covered	cargo test -p fparkan-platform-winit --offline window_port_reports_default_request_profile
 S0-PLAT-002	covered	cargo clippy -p fparkan-platform -p fparkan-platform-winit --all-targets --all-features --locked -- -D warnings
 S0-PLAT-003	covered	cargo test -p fparkan-platform-winit --offline smoke_window_plan_requires_native_handles_and_nonzero_extent smoke_window_plan_rejects_zero_extent
+S0-PLAT-004	covered	cargo test -p fparkan-platform-winit --offline smoke_window_app_requires_created_native_window smoke_window_app_rejects_synthetic_window_without_native_handles
 S0-VK-001	covered	cargo test -p fparkan-render-vulkan --offline backend_tracks_render_request_and_presents
 S0-VK-002	covered	cargo test -p fparkan-render-vulkan --offline device_scoring_is_deterministic_and_prefers_discrete_unified_queue
 S0-VK-003	covered	cargo test -p fparkan-render-vulkan --offline portability_subset_is_reported_and_enabled_when_exposed