Give the card name round-trip test a 20 s timeout

[nstarman]

Changing code or schema

What and why:

tests/cards.test.js > the grammar, at its edges > writes every name it reads as one it reads back the same failed twice in npm test on 2026-10-08 and passed on every re-run. The cause is a timeout, not the grammar:

• --testTimeout=300 reproduces it exactly: Error: Test timed out in 300ms.
• Alone, the test takes ~760 ms. With all cores busy it took 1.4–1.8 s, and with four full suites running at once 3.0–3.4 s, closing on vitest's 5 s default. The walk is seeded, so a real round-trip bug would fail every run, not some of them.
• All 3000 generated names parse and all 3000 are distinct, so every iteration covers something and cutting the count would cut coverage.

So this test alone gets an explicit 20_000 ms timeout. The iteration count stays at 3000.

No screenshots: this only changes a test, and the site is unchanged.

• npm test passes (unit, schema, bibtex, build, a11y, links)
• If a link.rel value or a type was added… n/a
• If a constraint was added… n/a

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