[babaliauskas]

Stacked on #66; merge that first. Until then this diff also shows #66's commit (9db862e). This PR's own change is 5cb8fe2.

What this changes

The Per-example breakdown and Trace rules broken tables listed every row: 21 and 16 on a real planner run, 100+ on a full captured suite.

• Folding. Each table now shows its first 10 rows (reports.html.TABLE_ROWS_SHOWN) and folds the rest, in the same table, under a "Show N more examples" / "Show N more broken rules" label. The label then reads "Show fewer".
• Order. The breakdown is already sorted regressed-first and worst-first, so the rows that matter stay visible.
• No script. The report is JavaScript-free by design. A visually hidden checkbox before the table drives a sibling-selector rule that hides .row-more rows. It works offline and from an email attachment, and the checkbox keeps keyboard focus, with a focus ring on the label.
• Short tables. A table of 10 rows or fewer gets no toggle.
• Print. A printed report shows every row: @media print forces .row-more visible and hides the label.

Template, CSS and one constant only; no data or report.json change. CHANGELOG, DOCS.md and llms-full.txt are updated.

Test plan

• New tests in TestLongTablesShowTheirFirstRows, each seen failing first:
  • 12 rows → 2 folded plus "Show 2 more examples" and "Show fewer";
  • 11 rows → the singular "Show 1 more example";
  • 10 rows → no toggle;
  • the trace-rules table folds the same way ("Show 3 more broken rules");
  • the print stylesheet shows .row-more.
• make ci: ruff, ruff format, mypy --strict, and pytest (3401 passed, 95.3% coverage)
• pre-commit run --all-files
• Rendered the real planner run (21 examples, 16 broken rules) and checked headless-Chromium screenshots of the folded and unfolded states

🤖 Generated with Claude Code