fix ci after #11: rustfmt rewraps in the round-4 test code

[marcuspat]

Four pure-formatting hunks from the #11 merge that CI caught (rustc is broken on the authoring Mac, so rustfmt never ran locally): the traversal-assert chain, the jt/jf tuple loop, the jump-count assert, and two golden-target asserts — exactly the forms rustfmt wants, zero semantic change.

[marcuspat]

Gate review — reviewer: claude

Lanes: reviewed by claude

GATE USAGE reviewer=claude in=2 cached=39,201 out=235 6s model=claude-haiku-4-5-20251001,claude-opus-5[1m] $0.279 API-equiv (not billed on subscription)

Diff is pure rustfmt rewrapping of test code — two line-breaks in filesystem.rs:565, and in sandbox.rs the for (name, target) in [...] array/brace split (819), the assert!(jumps >= 5, ...) wrap (830), and the two assert_eq! wraps (838, 843). No token sequence changes: same jump-target arithmetic, same comparands (13, 11), same assertion predicates and messages. Nothing added, removed, or weakened — the bounds loop still iterates both jt/jf, and the jumps >= 5 guard that keeps the walk from vacuously passing is intact.

VERDICT: APPROVED

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VERDICT: APPROVED