lokahi-interop: Invalidate decision path

Invalidate decisions in the round loop: capture, while the block is canonical, the archive output roots and the replacement material (deposit txs + header fields fully determining the deposits-only replacement) into the WAL; concurrent per-chain applies; acks with timeout, WAL-preserving retry with backoff, metric + eventual halted state; idempotent replay (controller inspects the canonical block at H).

Depends on: #22536.

🤖 *Co-created with Claude (Fable 5)*

Start by reading dependency #22536 and locating the round loop and controller path that inspects the canonical block at H. The work is complete when archive roots and replacement material are WAL-persisted, per-chain applies acknowledge with timeout and retry behavior, metrics and halted state are defined, and replay is idempotent.

Written by the indexing model from the issue text.