Index PPI project layers

docs/modernization/roadmap.md

@@ -313,8 +313,8 @@ task queue, and deterministic `TraceRecorder` now record
 component/name/thread/frame/stroke metadata with filtering, capacity, and
 invalid-end tests. `pp_assets` has started with PNG/JPEG signature detection,
 PNG IHDR metadata parsing, PPI header/project byte-layout/body-summary
-recognition, dirty-face PNG payload metadata validation, and a pure typed
-settings document model, with
+recognition, layer/frame indexing, dirty-face PNG payload metadata validation,
+and a pure typed settings document model, with
 corrupt/truncated/unsupported, extreme-dimension, and key/value limit tests.
 `pp_paint` has started with pure brush parameter validation/stamp evaluation,
 CPU reference math for the five current shader blend modes, and deterministic
@@ -330,7 +330,7 @@ length parsing, color parsing, tinyxml-backed layout XML parsing, and invalid
 input tests.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,
 `pano_cli inspect-project` reports validated PPI thumbnail/body byte layout,
-body summary, and dirty-face PNG payload metadata, and
+body summary, layer/frame descriptors, and dirty-face PNG payload metadata, and
 `pano_cli create-document` can create simple animation documents with explicit
 frame count/duration, and `pano_cli simulate-stroke` exercises the pure stroke
 sampler for scripted-stroke automation. `pano_cli simulate-stroke-script`
@@ -570,7 +570,8 @@ Results:
 - `pp_assets_image_format_tests` passed.
 - `pp_assets_image_metadata_tests` passed.
 - `pp_assets_ppi_header_tests` passed, including PPI thumbnail/body layout,
-  body summary validation, and dirty-face PNG payload metadata validation.
+  body summary validation, layer/frame indexing, and dirty-face PNG payload
+  metadata validation.
 - `pp_assets_settings_document_tests` passed.
 - `pp_paint_brush_tests` passed.
 - `pp_paint_blend_tests` passed.
@@ -591,8 +592,8 @@ Results:
 - `pano_cli_inspect_png_metadata_smoke` passed and reports PNG metadata JSON
   for the tiny IHDR fixture.
 - `pano_cli_inspect_project_layout_smoke` passed and reports PPI
-  thumbnail/body byte layout, body summary, and dirty-face PNG payload metadata
-  JSON.
+  thumbnail/body byte layout, body summary, layer/frame descriptors, and
+  dirty-face PNG payload metadata JSON.
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.