test(canvas): [PKG-CANVAS-05] checkpoint installed native picture-in-picture

packages/artplayer-plugin-document-pip/ARCHITECTURE.md

@@ -89,3 +89,9 @@ plugin 1.1.0; candidate core's event-document focus checks fix this independentl
 Candidate web fullscreen stays in the current ownerDocument body and restores
 its captured placement. This does not prove native fullscreen availability inside
 PiP, background throttling or physical-device support; PKG-DPIP-05 stays open.
+
+`canvas-dpip.spec.js` additionally checks native Canvas video/track adoption,
+subtitle seeking and all three close/destroy endings. Its installed mode requires
+the verified five-package map, including Document PiP; the helper rejects missing
+maps, stale inputs and conflicting source/artifact overrides. This is integration
+evidence, not full package release acceptance or physical-device evidence.

packages/artplayer-proxy-canvas/ARCHITECTURE.md

@@ -106,3 +106,10 @@ single-track ownership, ordinary Canvas child insertion/removal and escaped inse
 after destroy on old/new cores. It also belongs to the installed browser scope;
 keep its bytes and native engine provenance with the lifecycle report.
 See `refactor/canvas-validation.md` and the task evidence for actual outcomes and limitations.
+
+`canvas-dpip.spec.js` follows the same Canvas, backing video and native subtitle
+track into actual Document PiP windows. It covers playback/draw advancement,
+paused subtitle seeking and close/native-close/destroy resource ownership. The
+installed scope requires Document PiP's own verified package bytes as well; a
+source helper may not fill a missing installed package. Unsupported native APIs
+are recorded separately and never treated as native playback evidence.