Temporarily switch from the local schwab-browser sidecar to the
browserless endpoint used by the working CLI (browser.local.ben.io).
This tests whether /assert 403 is caused by browser environment drift.
- Update schwab-scraper to f52774b (optimized lot extraction polling,
faster account switching with selector-based waits)
- Install curl in Docker image so compose healthcheck works
- Remove bundled schwab_scraper/ source (now installed via git dep)
- Increase memory limit to 512M for large account position scraping
