Gap closure plans hardcode wave: 1 and depends_on: [], bypassing the
standard wave assignment logic. When multiple gap closure plans have
dependencies between them, they all land in wave 1 and execute in
parallel — ignoring dependency ordering. Add an explicit wave
computation step using the same assign_waves algorithm as standard
planning.
Closes#856
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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