Plan document export snapshot routing

docs/modernization/build-inventory.md

@@ -860,6 +860,10 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
 - `pano_cli plan-export-report` exposes `pp_app_core` export failure and
   license-disabled dialog metadata as JSON; live export dialogs consume the
   same metadata before retained legacy export execution or logging continues.
+- `pano_cli plan-export-snapshot-route` exposes the `pp_app_core` route policy
+  that decides whether payload-complete document snapshots use pure
+  document/renderer export writers or retained legacy exporters, including
+  target/platform unsupported and pending renderer-readback fallback reasons.
 - `pano_cli plan-export-start` exposes `pp_app_core` export availability
   planning for license-gated, demo-blocked, and missing-canvas states as JSON;
   the live image, layer, animation-frame, depth, and cube-face export dialogs
@@ -1052,8 +1056,9 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   handling, and invalid export naming inputs, plus export-start license/canvas availability decisions,
   export menu executor dispatch, file/stem/collection export execution
   dispatch, failed directory creation preservation, named depth/cube export
-  dispatch, malformed export target rejection, video export dispatch for
-  animation MP4/timelapse paths, and empty video-path rejection.
+  dispatch, malformed export target rejection, document-snapshot export route
+  policy, video export dispatch for animation MP4/timelapse paths, and empty
+  video-path rejection.
 - `pp_app_core_document_recording_tests` covers recording start/stop, clear,
   platform recorded-file cleanup, frame-count reset, export progress totals,
   oversized progress-total clamping, and recording-worker encode-wake