fix(sec): alert when a filing gap's reprieve lapses instead of re-pausing quietly

An escalated gap stops pausing setups while the issuer's own fundamentals are
still recent. That reprieve ends on its own — the stored filings age past
GAP_GATE_RECENT_FILING_DAYS, or a newer gap arrives and the all-escalated
condition fails — and nothing reported either, because filing_gap_aged only
escalates gaps whose escalated_at is NULL and so never fires twice for the same
gap. For the 43 issuers behind the previous commit that lands around
2026-10-26, when their late-April filings age out together.

sec_filing_gaps.exempted_at (migration 034) makes the transition observable:
stamped quietly while the issuer is exempt, cleared when the exemption lapses,
and the clear is what raises filing_gap_repaused — once per lapse, re-arming if
the issuer's data recovers and ages out again. A gap that was never exempt has
no transition and stays silent; it is simply still paused, which
filing_gap_aged already said.

gap_exempt_ciks is public so the importer alerts on membership changes in
exactly the set the gate reads, rather than restating the rule.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016Lo99z3jWqu9X9ueBU3Z3D

tests/unit/test_fundamentals_quality_service.py

@@ -257,3 +257,25 @@ async def test_summary_path_does_not_reblock_an_exempt_cik(db_session):
     await db_session.flush()
 
     assert await fundamentals_quality_service.blocked_ticker_ids(db_session) == set()
+
+
+async def test_a_newer_gap_ends_the_exemption(db_session):
+    """Production's second exit path: Q3 also fails to ingest, so an un-escalated
+    gap joins the escalated one and the issuer pauses again immediately."""
+    ticker = Ticker(symbol="NEWGAP", cik="0000000050")
+    db_session.add_all([
+        ticker, _escalated_gap(ticker.cik), _prior_quarter(ticker.cik, age_days=120)
+    ])
+    await db_session.flush()
+    assert await fundamentals_quality_service.blocked_ticker_ids(db_session) == set()
+
+    fresh = datetime.now(timezone.utc)
+    db_session.add(SecFilingGap(
+        cik=ticker.cik, accession="NEWGAP-Q3", form="10-Q", index_date=date.today(),
+        reason="not_in_companyfacts", first_seen_at=fresh, last_attempted_at=fresh,
+    ))
+    await db_session.flush()
+
+    assert await fundamentals_quality_service.blocked_ticker_ids(db_session) == {
+        ticker.id
+    }