Propagate bozo flag from entry-level fields #70
Description
Summary
Follow-up from #64 — read_text_str discards the bozo signal at entry-level call sites where ParsedFeed is not directly in scope.
Current behavior
Bozo flag is propagated only for feed-level fields:
- RSS:
<channel><title>,<channel><description> - Atom:
<feed><id>
Entry-level fields silently discard the bozo signal via read_text_str:
<item>/<entry>title, summary, content, id, author, etc.- All RSS 1.0 fields
Expected behavior
feed.bozo = true should be set when any text field in the feed contains unresolvable entities, including entry-level fields.
Implementation notes
Requires threading &mut ParsedFeed (or a bozo accumulator) through entry parsing functions (parse_entry, parse_item, parse_rss10_item). Consider a shared BozoAccumulator or passing &mut bool to avoid coupling entry parsers to ParsedFeed.