style: trim pairing sender-id comments

maintainer edit: remove redundant explanatory comments from the focused sender-id normalization tests and store change without changing behavior.

tests/pairing/test_store.py

@@ -175,25 +175,16 @@ class TestHandlePairingCommand:
 
 
 class TestNonStringSenderId:
-    """Sender IDs may be numeric (e.g. Telegram/QQ). The store normalizes them
-    to str so writes/reads/removals stay consistent with is_approved()."""
-
     def test_numeric_sender_id_round_trip(self) -> None:
         code = store.generate_code("telegram", 12345)
         assert store.approve_code(code) == ("telegram", "12345")
-        # Approved regardless of whether the caller passes int or str.
         assert store.is_approved("telegram", 12345) is True
         assert store.is_approved("telegram", "12345") is True
         assert store.get_approved("telegram") == ["12345"]
-        # Revoke also works with a numeric id.
         assert store.revoke("telegram", 12345) is True
         assert store.is_approved("telegram", "12345") is False
 
     def test_hand_edited_numeric_pending_does_not_corrupt_approved_set(self) -> None:
-        # A hand-edited *pending* entry may carry a numeric sender_id. Approving
-        # it must coerce to str so the approved set stays homogeneously str —
-        # otherwise the next _save()'s sorted() on a mixed int/str set raises
-        # TypeError (in fact approve_code()'s own _save() would already raise).
         store._store_path().write_text(
             '{"approved": {"telegram": ["111"]}, '
             '"pending": {"ABCD-EFGH": {"channel": "telegram", "sender_id": 222, '
@@ -202,13 +193,10 @@ class TestNonStringSenderId:
         )
         assert store.approve_code("ABCD-EFGH") == ("telegram", "222")
         assert store.is_approved("telegram", 222) is True
-        # A subsequent write must not raise on a mixed-type set.
         store.generate_code("telegram", 333)
         assert store.get_approved("telegram") == ["111", "222"]
 
     def test_numeric_id_in_hand_edited_store(self) -> None:
-        # Operators may edit pairing.json directly; a numeric entry must still
-        # match the str() lookup that is_approved() performs.
         store._store_path().write_text(
             '{"approved": {"telegram": [12345]}, "pending": {}}',
             encoding="utf-8",