explore-cross-call-dedup test fails on main since #2655 (struct field refs): call 2 re-sends cycle.go lines 31-35 #2756

__tests__/explore-cross-call-dedup.test.ts fails on current main (a5fe6e1), in the case "a second call against a real index > never re-sends a line it already sent, and points at every line it withholds":

→ call 2 re-sent internal/usecase/payroll/cycle.go lines 31,32,33,34,35
Tests  1 failed | 25 passed (26)

Repro: CODEGRAPH_KERNEL=0 npx vitest run --project engine __tests__/explore-cross-call-dedup.test.ts on a clean checkout (Linux / WSL2, Node 22.23.2).

Bisect (verified). git bisect run with that test, first-parent, between b8d46d1 (#1788, where the test last changed; passes) and 6e24711 (fails). The first failing commit is a944ec3, "fix(go): a struct links the types its fields are declared with" (#2655). Its parent, c7b5038, passes.

Likely cause (inferred, not traced). Lines 31–35 of the fixture's cycle.go are the RunResult struct:

type RunResult struct {
	CycleID         string
	Payslips        []payroll.Payslip
	TotalGrossCents int64
	TotalNetCents   int64

Since #2655 the struct has a references edge to Payslip through its field. My guess is that this pulls RunResult into the second explore call by a new path, so its lines are sent again instead of being withheld as already sent. I haven't checked whether the dedup bookkeeping or the test's expectation is the part that should change.

Searched existing issues and PRs for this test name and for dedup: none open.

Related: #2655 (the commit the bisect lands on).