Nightly Test Suite Results

## Nightly Test Suite Tracking This issue tracks nightly test suite results. Each night, the full test suite runs and posts results as a comment below. ### How to read the results - **Trend table** shows pass rates over the last 7 runs - **Regressions** are highlighted when a previously-passing suite starts failing - **Improvements** are highlighted when a previously-failing suite starts passing - Raw JSON results are stored in `test-results/nightly/` for graphing ### Data location - JSON results: `test-results/nightly/YYYY-MM-DD.json` - Comparison script: `scripts/nightly-compare.sh` - Workflow: `.github/workflows/nightly-test-suite.yml` --- _Results are posted as comments below, newest first._