docs: add a hand-recording shot list for the FGS video

The script is a convenience, not a requirement: any Android 11+ phone can record the same
journey from the quick settings, with no adb and no tooling. Spell out the six steps so the
take can be done by hand if that is easier, with the two things a reviewer needs to be able to
follow - the trigger, and the service still working after the app leaves the screen.

docs/PLAY_RELEASE_CHECKLIST.md

@@ -275,6 +275,20 @@ action except the items marked **[code]**.
          screenshots). Put the file where a reviewer can open it without signing in — an
          unlisted YouTube link is the usual choice — and paste that link in. Replacing the
          video later means resubmitting the declaration.
+
+         A hand recording is just as valid and needs no tooling at all: every Android 11+ phone
+         has a screen recorder in the quick settings, and the whole video is six steps —
+
+         1. the app on its intro,
+         2. tap *Start scan* — this is the trigger the declaration is about,
+         3. press Home, so the app is no longer on screen,
+         4. pull the notification shade down and let "Scan progress" sit there for a few
+            seconds, with its live counter and *Cancel* button, while the scan keeps running,
+         5. tap the app back into the foreground for the finished results,
+         6. stop the recording and upload it.
+
+         Keep it under two minutes and don't cut mid-way; a reviewer has to be able to follow
+         the trigger and see the service doing its job after the app leaves the screen.
          ⚠️ **Record it on a real device.** The capture proved unreliable on this machine's
          software-emulated AVD (no KVM), and both failures are platform-level rather than
          app-level: