chore: consolidate superseded experiment history into main
History-only merge: retain the original Node worktree snapshot1c7dd29without reverting its canonicalized implementation (63ea2beand subsequent main fixes). RAV004 commits 45019f8/cd16ea2/88e47fc and Gaussian commits 2ccf172/2e44e27 are patch-equivalent to commits already in main (verified with git cherry). The current source tree is intentionally unchanged; old snapshots remain reachable for audit.
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