feat(loops): planner-declared edge lineage — TopologyMove.parentIndex (#82)#85
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…#82) Closes #82. The kernel-inferred parentIndex is exact for every topology the current move vocabulary (refine/fanout/stop) can produce, but a future revisit/goto move (or any planner branching off a non-winner) needs the planner to DECLARE the branch source. The hook is now in place, additively: - TopologyMove refine/fanout gain optional `parentIndex` (the iteration this round branches from). - LoopPlanDescription gains `parentIndex`; createDynamicDriver.describePlan surfaces the pending move's value. - run-loop prefers a declared parentIndex over the inferred branchPoint: `planDesc?.parentIndex ?? (round 0 ? root : branchPoint(...))`. Nothing emits a non-trivial parentIndex yet (no revisit/goto move ships), so behavior is unchanged for refine/fanout — but the lineage is now faithful the moment such a move exists. Test: a declared parentIndex=0 overrides the inferred best-valid branch point. Full suite green, tsc + biome clean.
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Closes #82. Adds an optional
parentIndexto refine/fanoutTopologyMoves;describePlansurfaces it; the kernel prefers a declared parent over the inferredbranchPoint. Nothing emits a non-trivial value yet (no revisit/goto move ships) so refine/fanout behavior is unchanged — but lineage is faithful the moment such a move exists. Test proves a declaredparentIndex=0overrides the inferred best-valid branch point. Shipped0.40.0.