Native capture runtime observations (pass-through instrumentation)

Base: 95cb068c10a6cf0b33eed0a0cab3b298763fe852
Head: dcc264b5ba02ad9896c7a87cd5f7a9daffe984de

Times are seconds relative to recording-active caption.

BEFORE
+0.001s Agent recording active; both previews live
+4.008s Stopping agent recording…
+4.219s Recording STOPPED — watch both clocks
+10.395s Reset: reopen Viewer A for the close test
+11.304s Both viewers active again; watch both clocks
+15.422s Viewer A panel CLOSED — watch Viewer B clock
+4.034s native Page.stopScreencast {}
+10.453s native Page.stopScreencast {}
+11.120s native Page.stopScreencast {}
+11.122s native Page.startScreencast {"format": "jpeg", "quality": 70, "maxWidth": 539, "maxHeight": 783}
+15.368s native Page.stopScreencast {}
+21.792s native Page.stopScreencast {}

AFTER
+0.000s Agent recording active; both previews live
+4.008s Stopping agent recording…
+4.244s Recording STOPPED — watch both clocks
+10.554s Reset: reopen Viewer A for the close test
+11.430s Both viewers active again; watch both clocks
+15.483s Viewer A panel CLOSED — watch Viewer B clock
+10.693s native Page.startScreencast {"format": "jpeg", "quality": 70, "maxWidth": 320, "maxHeight": 175}
+11.338s native Page.startScreencast {"format": "jpeg", "quality": 70, "maxWidth": 539, "maxHeight": 783}
+21.794s native Page.stopScreencast {}
+27.491s native Emulation.setFocusEmulationEnabled {"enabled": false}
Final preview rendering: suspended
Final native document.hasFocus(): false
Observed after all panels/floating previews closed and a 12-second idle window.

Base cleanup focus was sampled before the existing five-second idle interval; no base focus verdict is claimed.
Normal UI close sends stop before detach. Abrupt session detach without a stop was not separately exercised.