Render captured canvas snapshots through renderer boundary

docs/modernization/roadmap.md

@@ -674,7 +674,10 @@ prepare and log a payload-completeness report from that snapshot before
 delegating to retained `Canvas::project_save`; the app-core snapshot boundary
 also has a tested pure PPI export helper, and
 `pano_cli plan-canvas-document-snapshot` runs that helper for payload-complete
-snapshots and reports generated byte/dirty-face summaries. Live save writer
+snapshots and reports generated byte/dirty-face summaries. The same automation
+now feeds payload-complete snapshots through the `pp_paint_renderer`
+document-frame compositor and renderer-neutral recording upload path, reporting
+texture, transition, byte, payload, and command counts. Live save writer
 replacement, export adoption, and renderer-owned readback remain under
 `DEBT-0010`/`DEBT-0013`/`DEBT-0036`.
 `pano_cli plan-image-import` exposes app-core planning for File > Import image
@@ -2219,6 +2222,10 @@ Results:
   report (`payloadComplete` and `canExportPpi`) used by the live save bridge,
   and payload-complete snapshots now run the pure `pp_document` PPI exporter
   and decoded-project summary before emitting `ppiExport` JSON.
+- The same payload-complete snapshot automation now uploads the active document
+  frame through `pp_paint_renderer::upload_document_frame_faces` and the
+  `RecordingRenderDevice`, emitting `rendererUpload` JSON with texture,
+  transition, command, byte, and active-frame payload counts.
 - `pp_app_core_document_import_tests` passed, covering wide equirectangular,
   legacy vertical cube strip, regular transform-placement, and invalid-dimension
   import route decisions, equirectangular service dispatch, transform import
@@ -2497,6 +2504,11 @@ Results:
   document-canvas tests decode the generated bytes, and
   `pano_cli plan-canvas-document-snapshot` reports `ppiExport` readiness,
   byte count, and dirty-face count for agent automation.
+- Payload-complete canvas snapshot automation also crosses the renderer
+  boundary now: `pano_cli plan-canvas-document-snapshot` records the same
+  snapshot through the pure document-frame compositor and renderer-neutral
+  texture upload stream, so agents can validate document/canvas payloads moving
+  into renderer commands before live canvas export/save writer replacement.
 - Snapshot creation now rejects invalid embedded RGBA8 face payloads before
   document export or history can persist malformed state.
 - Package-smoke wrappers validate the Windows CMake app executable/runtime