DRY pass #3: checklist near-misses live in the grammar fixture (#5373)

test_notes.py and derive.rs each kept the same six lines of prose that look
like a checklist item. Four were already task_lines cases in grammar.json;
the other two (empty brackets, no bullet) join them, so the web suite now
tests them too, and both hand lists go.

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

tests/test_notes.py

@@ -548,21 +548,6 @@ def test_parse_items_between_paragraphs():
     assert [i.text for i in parse_items("before\n- [ ] middle\nafter")] == ["middle"]
 
 
-@pytest.mark.parametrize(
-    "body",
-    [
-        "-[ ] no space after the dash",
-        "- [] empty brackets",
-        "- [ ]no space after the brackets",
-        "- [y] not a mark",
-        "a [ ] mid sentence",
-        "[ ] no bullet at all",
-    ],
-)
-def test_parse_items_rejects_near_misses(body):
-    assert parse_items(body) == []
-
-
 def test_parse_items_accepts_star_bullets_and_indentation():
     # `*` because markdown.ts already takes it for a plain bullet.
     body = "* [ ] star\n    - [x] indented"