Move project save post-commit planning to app core

docs/modernization/roadmap.md

@@ -715,8 +715,11 @@ and preserving the legacy direct-write fallback when the temporary file cannot
 be opened. The same app-core boundary now also classifies the post-write
 commit result for direct writes, successful temporary swaps, remove failures,
 and rename-after-remove failures before retained save metadata mutation
-continues. The same automation now feeds payload-complete snapshots through the
-shared
+continues. Post-save side effects are now planned there too: mark-clean,
+new-document commitment, timelapse sidecar gating, platform flush, progress
+cleanup, and title refresh are reported before retained execution performs the
+actual mutations and sidecar serialization. The same automation now feeds
+payload-complete snapshots through the shared
 `pp_paint_renderer::prepare_document_frame_export_readiness` report, which
 records renderer-neutral six-face texture upload commands and encodes the
 active document frame's six composited faces to PNG bytes. This gives CLI
@@ -2326,6 +2329,9 @@ Results:
   The command now reports the app-core commit plan for direct saves, successful
   temporary swaps, target-remove failures, and rename-after-remove failures,
   including whether the target may be missing after a failed swap.
+  It also reports the app-core post-commit side-effect plan, including
+  clean/new-document metadata updates, timelapse sidecar gating, platform
+  flush, progress cleanup, and title refresh.
 - 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,