feat: add Vulkan shader manifest validation

fixtures/acceptance/coverage.tsv

@@ -40,6 +40,9 @@ S0-VK-014	covered	cargo test -p fparkan-render-vulkan --offline swapchain_plan_p
 S0-VK-015	covered	cargo test -p fparkan-render-vulkan --offline swapchain_plan_uses_fifo_and_current_extent_fallbacks
 S0-VK-016	covered	cargo test -p fparkan-render-vulkan --offline swapchain_plan_rejects_missing_surface_data_and_empty_extent
 S0-VK-017	covered	cargo test -p fparkan-render-vulkan --offline swapchain_plan_json_and_recreation_reports_are_stable
+S0-VK-018	covered	cargo test -p fparkan-render-vulkan --offline triangle_shader_manifest_hashes_are_stable
+S0-VK-019	covered	cargo test -p fparkan-render-vulkan --offline shader_manifest_report_json_is_stable
+S0-VK-020	covered	cargo test -p fparkan-render-vulkan --offline shader_manifest_rejects_invalid_spirv_containers
 S0-LIMIT-001	covered	cargo test -p fparkan-binary --offline rejects_count_stride_overflow
 S0-LIMIT-002	covered	cargo test -p fparkan-binary --offline rejects_oversized_declared_allocation_before_read
 L1-P1-NRES-001	covered	cargo test -p fparkan-nres --offline licensed_corpora_nres_roundtrip_gates

fixtures/acceptance/stage_0_2_roadmap.md

@@ -40,6 +40,9 @@
 `S0-VK-015`
 `S0-VK-016`
 `S0-VK-017`
+`S0-VK-018`
+`S0-VK-019`
+`S0-VK-020`
 `S0-LIMIT-001`
 `S0-LIMIT-002`
 `L1-P1-NRES-001`