Fix NEW targets getting distance -1 when max_distance is set

[xytan0056]

computeDistances() was resetting all non-DIRECT targets to -1, overwriting the distance 0 that getDefaultDistance correctly assigned to NEW targets. The BFS only seeded DIRECT targets, so NEW targets stayed at -1 and were dropped by filterChangedTargetsByDistance.

Treat CHANGE_TYPE_NEW the same as CHANGE_TYPE_DIRECT in the BFS initialization: seed them at distance 0 so they survive distance filtering and propagate through reverse deps.

Test Plan

unit test

Issue

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