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/connection.py

@@ -908,6 +908,16 @@ class ShieldConnectionManager:
             self._logcat_task = None
 
     # ── t57: installed-app discovery ───────────────────────────────────────
+    #
+    # MARK — documented, not observed (t62 nit c): the output SHAPES the two
+    # listing commands rely on (`pm list packages -3` → `package:<id>` lines,
+    # `cmd package resolve-activity --brief -c …HOME` → `package/activity`) are
+    # Android's documentation, not a captured run: no real Shield was available
+    # when discovery was written (t57). Every fixture in
+    # tests/test_installed_apps.py is built from those shapes and the parsers in
+    # ``ha_adb_common.installed_apps`` are deliberately tolerant of whitespace
+    # and ordering. Same mark as the state=6 buffering inference in
+    # ``media_player.py``.
 
     #: t62 F1: how long after an ATTEMPTED sweep failed before another one is
     #: issued. A retry costs two listing shells, so it waits out one state poll