[thclark]

Moves every yFoil figure to ironlab 0.16.0, removes the workarounds that 0.12 forced, and builds the branch-coverage occupancy figures with ironlab instead of matplotlib.

Workarounds removed

These were recorded in thclark/ironlab#76–#80:

• yfoil plot analysis: Cp is drawn on a reversed axis (suction up) instead of −Cp.
• yfoil plot foil:
  • The axes keep equal aspect, in the viewer too, instead of limits widened from plot areas measured on 0.12 renders.
  • It has two keys: the curves, and the markers (each shape and side colour explained once, as custom items).
  • It cycles six dash patterns instead of four.
• Legends:
  • Key rows are sized to fit their legends, replacing hand-calibrated row weights and trial PDF exports.
  • A base or default case is drawn on top but listed first, on a row of its own.
  • Stacks that share x show tick labels on the bottom row only.
• Aerofoil-series sheets: regular ticks shared by every panel, left-aligned titles, and the original titles restored. The held parameters title each panel's legend so the titles fit.
• Comparison sheets (series-cases, known-issues):
  • NaN values are marked by ticks pinned to the top edge, so the axes autoscale again.
  • Reference lines are hline/vline, which span the axes at any zoom.
  • Case names are set in monospace.
• Transition-position strip: rows are named by case on a categorical axis, first at the top. The numbering series and NaN placeholder points are gone.
• Saving: figures::save refuses a figure whose layout overflows a legend, clashes two legend entries or puts text off the page. It checks with layout_warnings(), without exporting a PDF.

Not removed

• The aerofoil outline under the Cp plot stays a separate strip: ironlab decided against inset axes (#80).
• Off-scale values are still clamped at the axis edge: ironlab decided against clamp-and-flag (#78).

Occupancy figures

The branch map and case × subroutine matrix are ironlab figures built in Rust (thclark/ironlab#74). The branch map uses occupancy under grouped category rows; the case matrix uses cells, with turned monospace case labels and a panel colourbar.

• Counts: ironlab has no table chart yet (Add table chart type ironlab#121), so the per-subroutine counts from the matrix's margin are now a published table, subroutine-counts.
• Removed: plot.py, studies/figures/ (render.sh, style.py, the uv/matplotlib pin) and the two committed SVGs.

Regenerated figures

Every committed .fig is regenerated, because files saved by 0.12 (schema 0.4) are rejected by 0.16:

• the user guide's figures, by scripts/guide-figures.sh;
• each study's figures, re-rendered from the run its docs were already published from and republished with cargo xtask publish, so no table numbers change;
• the docs' ironlab-web bundle in scripts/docs.sh, pinned to 0.16.0 with its checksum.

All 52 figures load with no validation or layout warnings.

Figure "labels" are renamed to "tags", after ironlab. docs/development/conventions/figures.md, CLAUDE.md and the user guide are updated.

Checks

• clippy -D warnings on the workspace, and cargo fmt --check
• lib, application and apparatus tests, and each study crate's tests
• ci/no-deviations.sh and scripts/docs-check.py

The execution and subroutine suites were not run; nothing in them touches figures.