Pilot conservative input tooltips

[jbkunst]

What changed

• Audited canonical app.R files associated with app DESCRIPTION metadata.
• Implemented the complete tooltip treatment in one representative app, lorenz-attractor, before expanding the pattern further.
• Added accessible icon titles, Bootstrap spacing, and hover focus click triggers for keyboard and touch/click use.
• Documented the repository-wide selection criteria, implementation pattern, and validation expectations in README.md.

Pilot selection: Lorenz Attractor

• sigma: how quickly x follows y.
• rho: driving strength and whether chaotic behavior emerges.
• beta: damping in the z direction.
• dt: numerical accuracy versus simulated time per point.

The obvious Number of points control was intentionally left without help.

Audit result

The wider audit identified possible future candidates in decision trees, logistic regression, ROC curves, network structures, and dimensionality-reduction apps. They are intentionally not implemented in this PR because pull-request builds validate compatibility but do not provide a visual preview artifact. This keeps the change aligned with the rule to prove the full treatment in one app before expanding it.

app-template, shap-explorer, alternative app_*.R files, and matrix-decompositions without a canonical app.R were excluded from implementation.

Validation

• The final diff contains only lorenz-attractor/app.R and README.md.
• Input IDs, defaults, ranges, and server behavior are unchanged.
• Existing label typography is preserved.
• All new visible text is in English and each tooltip explains one idea in fewer than 25 words.
• The icon has an accessible title and supports hover, keyboard focus, and click/touch.
• GitHub Actions successfully installed dependencies, exported the Shinylive apps, and rendered the complete site.
• Visual normal-width and narrow-width inspection remains a manual review item before extending the pattern to other apps.