Drop now-unused ReachesCommit wrapper

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Soph2mo ago

PlanRef now calls CheckAncestry directly, leaving ReachesCommit with no production caller — only a benchmark used it. Point the benchmark at CheckAncestry and remove the wrapper rather than leave dead exported surface.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: cf5b16a42703

Checkpoints

just remove .clawpatch from the commit but then just delete the folder, we don't need to keep it

Claude CodeOpus 4.8[1m]
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