andrexibiza's F19 (review 5407834086, inline): _capture_lines() returned after
the first eager capture it met. The reverse stack reaches an existing dict
entry first, so inserting `"new": os.getenv("HOME"),` above
`"old": os.getenv("PATH"),` produced no new HX005 occurrence and the
comparison could not charge it.
Every independent capture is now emitted (dict entries, list items, defaults);
a capture nested inside another (`expanduser(getenv(...))`) is the same
occurrence and is not entered, and per-line duplicates still collapse in the
measurer. Deferred bodies stay excluded. Tested through the real comparison
path: added dict/list/default captures block, a lambda entry and unchanged
debt pass, a separate assignment blocks.
a52a7f829b