Preserve forked Beacon behavior across restart

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Resume a development L1 without reinterpreting its fork identity or losing locally published blobs.

• Reject incompatible fork, Beacon, chain and simulated-finality identities before loading.
• Restore canonical time, fees and EVM block hashes, and replace stale live history.
• Keep state dumps coherent with mining and avoid shutdown dump deadlocks.
• Preserve legacy state loading outside Beacon mode and document resume requirements.

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Validation complete: all 10 new persistence regressions passed in CI, including real SIGTERM/restart, exact blob-byte preservation, EVM BLOCKHASH restoration, boundary fees, identity rejection and deterministic shutdown-lock tests. The combined branch passed 269 selected offline Anvil tests locally. Clippy, formatting, feature-combination checks, documentation and doctests passed in CI.

CI remains blocked outside this diff: RUSTSEC-2026-0285 in the unchanged rustls lockfile entry; the same five Forge CLI fixture/output/external-RPC failures as the base branch CI; and missing OpenZeppelin sources in the external snekmate fixture. The workspace suite finished with 1,356 passed and five failed; external integrations finished with 11 passed and one failed. No checks were disabled.

The draft is not merge-ready until that separate repository/dependency maintenance is resolved. No full Base snapshot-devnet session was run, and no user snapshot data was changed.

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Smaller draft replacements are now available: #79 covers coherent state operations; #86–#88 cover identity-bound dumps, canonical restoration and real process restart qualification. The dependency map and combined local verification are in #88.

Keeping this draft and its branch intact while replacement CI and the Base integration pin are unresolved. No existing revision or running experiment was changed.

Comment generated by Amp.