chore: decommission FMP, Finnhub and Alpha Vantage (A6)

The A5 cutover has been on and observed in production, so SEC Company Facts +
DoltHub earnings are already the live source for `fundamental_data`. This
removes everything the legacy path still occupied.

Gone: the three providers and their config/env keys; the weekly
`fundamental_collector` job; the cutover toggle (SEC + Dolt is now the
unconditional path, so `off` can no longer silently freeze scoring inputs); the
A5 parity report, whose deltas became structurally zero once the candidate
builder started writing the table it compared against; and the FMP tier of
universe bootstrap.

Two behavioral notes:

- Disabling **SEC Fundamentals Import** now stops the SEC network fetch only.
  The local cache refresh moved outside the job-enable check, because candidates
  also derive from daily closes and earnings events — freezing those on an
  ingestion pause would stale scoring with no fallback left to recover from.
- `/ingestion/fetch?sources=fundamentals` still accepts the key and reports
  `skipped`; there is no per-ticker fetch any more.

Migration 029 does not blanket-delete the leftover settings rows. Migrations run
before the service restart, and pre-A6 code reads an absent `job_*_enabled` row
as *enabled* — so the two behavior-bearing keys become tombstones pinned to safe
values (hidden in Admin) and only the inert three are deleted. Removing the
provider keys from the production `.env` is the matching rollout step.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/unit/test_fundamental_data_refresh.py

@@ -15,7 +15,6 @@ from app.models.fundamental import FundamentalData
 from app.models.fundamental_snapshot import FundamentalSnapshot
 from app.models.ohlcv import OHLCVRecord
 from app.models.score import CompositeScore, DimensionScore
-from app.models.settings import SystemSetting
 from app.models.ticker import Ticker
 from app.services import fundamentals_candidate_service as candidates
 from app.services import fundamentals_derivation as deriv
@@ -76,49 +75,9 @@ def _snapshot_rows(cik: str) -> list[FundamentalSnapshot]:
     return rows
 
 
-async def test_default_off_performs_no_candidate_read_or_write(
-    session: AsyncSession, monkeypatch
-):
-    ticker = Ticker(symbol="AAA")
-    session.add(ticker)
-    await session.flush()
-    session.add(
-        FundamentalData(
-            ticker_id=ticker.id,
-            pe_ratio=12,
-            revenue_growth=3,
-            earnings_surprise=1,
-            market_cap=100,
-            fetched_at=NOW,
-        )
-    )
-    await session.commit()
-
-    async def should_not_read(*args, **kwargs):
-        raise AssertionError("default-off refresh derived candidates")
-
-    monkeypatch.setattr(candidates, "build_candidates", should_not_read)
-    summary = await refresh_service.refresh_if_enabled(session, today=TODAY)
-
-    stored = await session.scalar(
-        select(FundamentalData).where(FundamentalData.ticker_id == ticker.id)
-    )
-    assert summary == {
-        "enabled": False,
-        "refreshed": 0,
-        "score_inputs_changed": 0,
-        "dimension_scores_staled": 0,
-        "composite_scores_staled": 0,
-    }
-    assert stored.pe_ratio == 12
-
-
-async def test_activated_refresh_updates_all_fields_and_invalidates_scores(
+async def test_refresh_updates_all_fields_and_invalidates_scores(
     session: AsyncSession,
 ):
-    session.add(
-        SystemSetting(key=refresh_service.ACTIVATION_KEY, value="true")
-    )
     first = Ticker(symbol="AAA", cik="0000000001")
     second = Ticker(symbol="AAB", cik="0000000001")
     session.add_all([first, second])
@@ -191,7 +150,7 @@ async def test_activated_refresh_updates_all_fields_and_invalidates_scores(
         )
     await session.commit()
 
-    summary = await refresh_service.refresh_if_enabled(
+    summary = await refresh_service.refresh(
         session, now=NOW, today=TODAY
     )
 
@@ -225,7 +184,7 @@ async def test_activated_refresh_updates_all_fields_and_invalidates_scores(
     for row in (*dimensions, *composites):
         row.is_stale = False
     await session.commit()
-    unchanged = await refresh_service.refresh_if_enabled(
+    unchanged = await refresh_service.refresh(
         session, now=NOW + timedelta(hours=1), today=TODAY
     )
     assert unchanged["score_inputs_changed"] == 0