- _fetch_candles now accepts explicit from_ts/to_ts timestamps; falls
back to count-based window when omitted
- get_historical_candles accepts from_date/to_date in YYYY-MM-DD,
YYYY-MM-DD HH:MM, or YYYY-MM-DD HH:MM:SS formats (all UTC)
- Yahoo Finance fallback switched from range= to period1/period2 so
it respects the exact window in both modes
- Added 11 tests covering date range, datetime, end-of-day bump,
invalid format, count cap, and pattern detection toggle
- gitignore uv.lock (Dockerfile uses pip, not uv sync)