fix(design-challenge): drop crate_name so loc-cap is under 1500

[echobt]

Summary

• crates/design-challenge is 1501 LOC (cap 1500); cargo test -p xtask fails closed.
• Remove unused crate_name helper (only referenced from its own unit test).

Test plan

• CI loc-cap / cargo test

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📥 Commits

Reviewing files that changed from the base of the PR and between 8043a78 and 0b303c3.

📒 Files selected for processing (1)

• crates/design-challenge/src/lib.rs

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