docs(discovery): the not-observed mark lands in the in-scope module (t62 nit c)

The "no real Shield was available, so this output shape is Android's
documentation rather than a capture" mark lived only in the test module, where a
reader of the discovery code never looks. It now sits in connection.py's
discovery section — the module that issues the two listing commands — and in the
README next to the command table, matching the state=6 buffering inference mark.

This replaces the copy that had been added to
ha_adb_common/installed_apps.py: t62's in-scope set is connection.py, sensor.py,
README.md and tests/, and the completion contract rejects a changed path outside
it, so the parser-module copy is reverted rather than left undeclared. The
discovery section above names that parser module, so the mark is still found
from the code it qualifies.

custom_components/nvidia_shield/ha_adb_common/installed_apps.py

@@ -5,13 +5,6 @@ fallback list: only four packages were ever offered, so a user with Wholphin,
 SmartTube, Kodi, Plex or anything else saw nothing. The device knows its own
 apps, so this module asks it.
 
-MARK — documented, not observed: the command SHAPES below are Android's own
-documentation, not a captured run. No real Shield was available when this was
-written (t57), so every fixture in ``tests/test_installed_apps.py`` is built from
-those documented shapes, and the parsers are deliberately tolerant of whitespace
-and ordering. This is the same "inferred, not observed" mark the ``state=6``
-buffering value carries in ``media_player.py``.
-
 The commands (both plain `pm`, available on Shield Experience 9 / Android 11
 with no extra permission beyond the ADB pairing this integration already has):