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/config.py

@@ -28,15 +28,6 @@ class Settings(BaseSettings):
     deepseek_api_key: str = ""
     xai_api_key: str = ""
 
-    # Fundamentals Provider — Financial Modeling Prep
-    fmp_api_key: str = ""
-
-    # Fundamentals Provider — Finnhub (optional fallback)
-    finnhub_api_key: str = ""
-
-    # Fundamentals Provider — Alpha Vantage (optional fallback)
-    alpha_vantage_api_key: str = ""
-
     # Dolt bulk-data — local clone of post-no-preference/earnings (workstream A).
     # dolt_binary: full path when not on PATH (dev/Windows install). dolt_data_dir
     # holds the clones; in production it MUST be outside the deploy tree (deploy is
@@ -61,10 +52,6 @@ class Settings(BaseSettings):
     sec_max_retries: int = 4
     sec_request_timeout_seconds: float = 30.0
 
-    # A5 read-only comparison artifacts. Production must keep this outside the
-    # rsync deployment tree so the 5-7 day review window survives deploys.
-    fundamentals_parity_report_dir: str = "reports/fundamentals-parity"
-
     # Regime Monitor — FRED (VIX level + HY credit spreads). Optional: without it
     # the volatility (P5) and credit-spread (F2) signals are reported as n/a.
     fred_api_key: str = ""
@@ -86,15 +73,8 @@ class Settings(BaseSettings):
     # the score window is 7 days).
     sentiment_fresh_hours: int = 120
     sentiment_top_composite: int = 30
-    fundamental_fetch_frequency: str = "weekly"  # quarterly-ish data; weekly conserves API quota
     rr_scan_frequency: str = "daily"  # legacy label; qualifying scan is cron near-close
     # alerts_frequency removed: alerts fire only via morning + near-close pipelines
-    fundamental_rate_limit_retries: int = 3
-    fundamental_rate_limit_backoff_seconds: int = 15
-    # Pause between tickers in the bulk fundamentals job. Free tiers throttle
-    # hard (Finnhub ~60 calls/min, ~3 calls/ticker → ~3s/ticker); without
-    # spacing the job bursts straight into 429s. 0 disables.
-    fundamental_request_spacing_seconds: float = 3.0
 
     # Scoring Defaults
     default_watchlist_auto_size: int = 10