Root cause chain (evidence: 25+ failed traces on nproj/3022414):
straight quote in page text ends the guided-decoding JSON string
early -> grammar deadlock -> whitespace loop until context/token
limit -> chat_json fails 3x (~35 min) -> IMAP conn idles out ->
move_to_trash raises -> mail never trashed -> reprocessed forever.
- ingest/mailer: MailBox.ensure_alive() reconnect before finalize;
move_to_trash failure falls back to flag_checked, run continues
- stages: page_text() feeds only div.content minus skill-tag cloud
to the LLM and maps quote chars to apostrophes (the actual
degeneration trigger, live-verified: extract now OK in 21 s)
- llm: requirements maxItems 40; max_tokens 8192 caps degenerate
runs at ~100 s instead of ~10 min
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
