fix(sports_rankings): skip a malformed poll entry; rank each side by its own id (#791)

* fix(sports_rankings): skip a malformed poll entry; rank each side by its own id

The two review points deferred on #789 until sports_rankings was the only
copy (the nine scoreboards adopted it in ledmatrix-plugins #648):

- A poll entry whose "current" is None or a string raised TypeError at
  `current_rank <= 0`; the broad except returned {} without setting the
  cache timestamp, so every team lost its rank and the standings were
  re-fetched on every update. The entry is now skipped.
- _ranked_positions() fell back to abbreviations for BOTH sides when only
  one side's id was unparseable, so a colliding abbreviation could rank the
  wrong school. It now decides id-or-abbreviation per side.

Well-formed ESPN data (ids on both sides, int ranks) ranks as before.
SPORTS_UNIFICATION.md: family 8 marked done and adopted.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(changelog): a numeric-string rank is still accepted; say which values are skipped

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

test/test_sports_rankings.py

@@ -173,6 +173,11 @@ def test_only_a_league_with_a_poll_is_asked(clock, league, asked):
         {"current": 3, "team": {"id": "abc", "abbreviation": "OSU"}},
         {"current": 4, "team": {"abbreviation": "TEX"}}]}]},
      {"OSU": 3, "TEX": 4}, {87: 2}),
+    ({"rankings": [{"name": "AP Top 25", "type": "ap", "ranks": [     # #789: one bad entry
+        {"current": None, "team": {"id": "61", "abbreviation": "UGA"}},
+        {"current": "n/a", "team": {"id": "87", "abbreviation": "ND"}},
+        {"current": 3, "team": {"id": "194", "abbreviation": "OSU"}}]}]},
+     {"OSU": 3}, {194: 3}),
 ])
 def test_payload_shapes(clock, payload, abbr, ids):
     host = Host(payload=payload)
@@ -320,6 +325,17 @@ def test_ranked_and_best_rank(clock, label, best):
     assert host._is_ranked_game(game(label)) is (best != 99)
 
 
+@pytest.mark.parametrize("home, away, best", [
+    (NEWARK, (None, "VAN"), 99),         # Newark's id is unranked; "OSU" must not rank it
+    (("61", None), (None, "VAN"), 1),    # UGA's id still counts with no id on the other side
+])
+def test_each_side_is_ranked_by_its_own_id(clock, home, away, best):
+    """#789: one side's missing id no longer sends both sides to abbreviations."""
+    g = {f"{side}_{key}": value for side, team in (("home", home), ("away", away))
+         for key, value in zip(("id", "abbr"), team) if value is not None}
+    assert loaded()._best_rank(g) == best
+
+
 #: filter -> (quality, divisions, poll loaded?, kept: one Y/. per GAMES entry)
 FILTERS = {
     "any": ("any", (), True, "YYYYYYYY"),