epic(state-prune): complete snapshot-based GC (snapshot + replay)

[jolestar]

Overview

Parent tracking issue for making snapshot-based state pruning (snapshot + replay) production-ready. This breaks down the known gaps into prioritized child issues.

Priority-ordered plan

P0 (blocking correctness)

• fix(replay): load snapshot store from snapshot path #3900 load snapshot store from snapshot path
• feat(replay): implement changeset range loading #3901 implement changeset range loading
• fix(replay): strict final state root verification #3902 strict final state root verification

P1 (correctness/UX)

• fix(snapshot): preserve nodes_written across resume #3903 preserve nodes_written across resume
• feat(snapshot): honor --tx_order and fill SnapshotMeta #3904 honor --tx_order and fill SnapshotMeta

P2 (cleanup/quality)

• chore(snapshot): remove unused/unsupported config knobs #3905 remove unused/unsupported config knobs
• test(state-prune): add end-to-end snapshot+replay coverage #3906 add end-to-end snapshot+replay coverage

Notes

• If any P0 issue reveals additional blockers, add them here and keep ordering by severity/impact.