"Cockroach" recovery#18
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Splits the sequencer into a library plus setup/run/flush subcommands, extracts the accept scheduler into a shared core compiled into both the on-chain canonical machine and the off-chain sequencer, and adds cockroach recovery — an operator-driven rebuild of a wiped or diverged DB from a trusted checkpoint plus L1. Integrates with the existing Lua watchdog. - Library + commands: `sequencer` is a pure library (binaries in examples/wallet-sequencer); `setup` / `run` / `flush-mempool` boot phases with classified exit codes for an orchestrator. - Duality: the off-chain accept-predicate and the canonical fold run the same `sequencer-core` scheduler, held in agreement by a differential test (I1). Addresses are app data — the core scheduler is address-agnostic; the app owns its sequencer addresses. - Cockroach recovery (`setup --recovery`): flush -> fold -> fill rebuilds (S', N') from a checkpoint + L1; the batch tree is anchored at the resume nonce N', and the (C, H1] suffix is executed exactly once by `run` (no double-execute, no lost deposit). Disjoint-range asserts, fail-loud partial-recovery guards, and a deferred gold frontier keep the rebuild sound. - Keyed-write safety: every L1-signing path (submitter, flush-mempool, both recovery flushes) re-verifies the RPC chain id and the key<->submitter identity immediately before signing; the long-lived submitter re-checks per send. Write-before-broadcast watermark (R1a); observed nonces folded in canonical L1 order. - Watchdog: the wallet snapshot (executed state + last_executed_safe_block) is served at GET /finalized_state; the Lua watchdog byte-compares it against an independent from-genesis cartesi-machine replay. Verified: workspace unit + integration suite, clippy -D warnings, fmt clean; canonical guest tests; e2e green (genesis + non-genesis watchdog compares, cockroach setup -> run round-trip).
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