F8: extract emitMoveWithBody helper (renamesMoves + body update with
basePath=oldPath) and call it at all three rename emission sites (ghost-move
A, ghost-move M, R/C) — byte-identical behavior, single F4 rationale. Helper
placed above computePushActions so the planner JSDoc stays attached.
F7: add an M-side ghost-move test (D+M same pageId) asserting the move and the
body update carry basePath=oldPath — the previously-untested branch.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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