run fundamentals weekly, not daily — it's quarterly-ish data

Pulled the fundamental collector out of the daily pipeline (where it re-fetched
near-identical numbers every day and burned free-tier API quota) and made it an
independent weekly job. P/E/market-cap drift with price but the score buckets
them coarsely; revenue growth and earnings surprise only change at quarterly
earnings. Added "weekly" to the frequency map; fundamental_fetch_frequency now
defaults to weekly (configurable).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/config.py

@@ -50,7 +50,7 @@ class Settings(BaseSettings):
     sentiment_fresh_hours: int = 72
     sentiment_max_per_run: int = 25
     sentiment_top_composite: int = 30
-    fundamental_fetch_frequency: str = "daily"
+    fundamental_fetch_frequency: str = "weekly"  # quarterly-ish data; weekly conserves API quota
     rr_scan_frequency: str = "daily"
     alerts_frequency: str = "hourly"
     fundamental_rate_limit_retries: int = 3