JOINs news_sentiment with krx_master for name fallback. Sorted by
score DESC. Date param defaults to latest. Empty table returns
{date: null, count: 0, items: []}. 4 integration tests pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Reuses get_portfolio() and adds pnl_pct (ratio, profit_rate/100) to
each holding plus total_pnl_pct to summary. 4 integration tests pass.
verify_webai_key dependency enforced.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
