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>

app/services/fundamental_data_refresh_service.py

@@ -1,4 +1,7 @@
-"""A5 activation: refresh the legacy fundamentals cache from local bulk data."""
+"""Refresh the fundamentals compat cache from local SEC/Dolt bulk data.
+
+``fundamental_data`` is the table scoring reads. This is its only writer.
+"""
 
 from __future__ import annotations
 
@@ -12,38 +15,11 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import insert_for_session
 from app.models.fundamental import FundamentalData
 from app.models.score import CompositeScore, DimensionScore
-from app.services import fundamentals_candidate_service, settings_store
+from app.services import fundamentals_candidate_service
 
-
-# Absence is deliberately false. Production activation therefore requires one
-# explicit, durable SystemSetting change after the A5 evidence is approved.
-ACTIVATION_KEY = "fundamental_data_sec_dolt_cutover_enabled"
 _SCORE_FIELDS = ("pe_ratio", "revenue_growth", "earnings_surprise")
 
 
-async def is_enabled(db: AsyncSession) -> bool:
-    raw = await settings_store.get_value(db, ACTIVATION_KEY, "false")
-    return str(raw).strip().lower() == "true"
-
-
-async def refresh_if_enabled(
-    db: AsyncSession,
-    *,
-    now: datetime | None = None,
-    today: date | None = None,
-) -> dict[str, Any]:
-    """Refresh atomically when activated; otherwise perform no writes."""
-    if not await is_enabled(db):
-        return {
-            "enabled": False,
-            "refreshed": 0,
-            "score_inputs_changed": 0,
-            "dimension_scores_staled": 0,
-            "composite_scores_staled": 0,
-        }
-    return await refresh(db, now=now, today=today)
-
-
 async def refresh(
     db: AsyncSession,
     *,
@@ -117,7 +93,6 @@ async def refresh(
 
     await db.commit()
     return {
-        "enabled": True,
         "refreshed": len(candidates),
         "score_inputs_changed": len(changed_ids),
         "dimension_scores_staled": len(dimension_ids),