Stop the Fig. 2 legend, stats and Exp. 03 eyebrow wrapping awkwardly

[BrickerP]

What

Three small wrapping fixes found while re-walking the live page after #95 and #98.

• Fig. 2 legend: each term (μ · drift…, σ · volatility…, dW · the dice…) is now one unbreakable unit, so a narrow screen stacks three whole lines instead of leaving σ · and dW · stranded at line ends. The · between terms is gone; spacing does that job.
• Fig. 2 stats: same treatment for the measured numbers, so the row no longer ends with a dangling · when it wraps.
• Exp. 03 eyebrow: dropped · monthly, so Exp. 03 · open research and 10 models · 8 labs stay on one row at 940px and up. Before, the right half fell to a second line at 940px wide, which also pushed that card's rule out of line with Exp. 02. This is a copy trim only: say so if you would rather keep monthly and accept the wrap.

No numbers, links, or canvas drawing change.

Checked

• npm run typecheck and npm run verify:static.
• Real browser against the dev server at 390, 940, 1024 and 1440 wide: legend terms never split (3 / 2 / 1 / 1 rows), the stats row carries no ·, the Exp. 03 eyebrow sits on one row at 940 and up (on 390 it wraps like every other card), no horizontal overflow, no console errors.