v0.17.1 — revert TED no-deadline=>closed (hid open calls)

[0.17.1] — 2026-06-15 — Revert the TED "no deadline ⇒ closed" rule (it hid open calls)

Fixed

• Reverted the 0.17.0 TED status rule. It was wrong and harmful. The premise ("a
  biddable TED call always states a deadline") does not hold: the TED search API,
  as read by the adapter (only deadline-receipt-tender-date-lot), returns no
  deadline for many genuine open calls. Measured on the corpus: of the 41
  deadline-less TED notices, only 2 are awards/results — 32 are open calls
  ("PROCEDURA APERTA", forniture, gare). So "no deadline ⇒ closed" was hiding ~32
  live, biddable tenders — the worst error for an opportunities radar (a false
  negative costs the user a real chance). A missing deadline once again defaults to
  open (recall-safe). The eval corpus's TED statuses were restored; the
  human-reviewed gold and the (unchanged) matching numbers from 0.17.0 stand — the
  rule never affected the eval (TED tenders are dropped at Stage 1 by seeks/keyword
  for these profiles anyway), only production.
• Lesson / real root cause: the actual "closed-shown-as-open" items are the
  Lazio past-edition bandi (no structured deadline in the WP body), not TED. The
  proper TED improvement is to capture the deadline that exists on the notice
  (read beyond the lot-level field) — which needs live TED data to validate, so it is
  deferred rather than guessed.