fg_market_scraper.py: broaden user.php href regex to allow a path prefix
before user.php (some topic pages use relative paths like ../user.php).
fg_scrape_pipeline.sh: --days 21 -> --days 60 for a fuller price history.
improve_fg_estimates.py: hoist min_valid_price constant out of the per-file
loop (was a constant being re-assigned every iteration).
fg_daily_estimates.json: refreshed from 853 topics over 60 days (was 21).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>