op-revm: rename OpSpecId::INTEROP to OpSpecId::LAGOON

[claude]

Requested by Sebastian Stammler · Slack thread

Before

The Interop hardfork was renamed to Lagoon across the monorepo in #21105 (the interop feature keeps its name; only the fork was renamed). The in-tree op-revm spec enum was missed: the fork/spec that Lagoon activates was still named OpSpecId::INTEROP (with name string "Interop"), and comments at the use sites — e.g. the last entry of FORK_CHRONOLOGY in rust/alloy-op-evm/src/env.rs — had to explain the stale name ("op-revm still names this spec INTEROP").

After

The spec is named OpSpecId::LAGOON (name string "Lagoon"), matching the fork naming everywhere else in the repo. The interop feature itself keeps its "interop" name — feature-level identifiers like is_interop_active, interop crates/packages, and setFeature(INTEROP) are untouched.

How

Mechanical rename of the OpSpecId::INTEROP variant, its name::INTEROP = "Interop" constant (used by FromStr/Into<&str>), and all use sites (FORK_CHRONOLOGY, precompile spec matches in op-revm and kona's FPVM provider, kona's RollupConfig::spec_id, and test utilities), plus the doc comments that existed only to explain the stale name. cargo +nightly fmt --check is clean on the touched crates; cargo check could not run in the sandbox (the pinned paradigmxyz/reth git dependency is unreachable there), so compile verification relies on CI.

Notes for reviewers:

• Serde/string compat: OpSpecId derives serde, so the serialized variant name changes INTEROP → LAGOON, and OpSpecId::from_str now accepts "Lagoon" instead of "Interop". Nothing in-tree persists or parses these strings, so no alias was kept — matching Lagoon hardfork rename #21105, which added serde aliases only for persisted config keys (interop_time/interopTime).
• Overlap: kona: reuse shared OP EVM env builder #22130 (kona: reuse shared OP EVM env builder, open at time of writing) also touches rust/alloy-op-evm; whichever lands second needs a trivial rebase.
• No open issue tracks this rename. Related (all closed): Lagoon hardfork rename #21105 (the original fork rename), Coordinate interop_time → lagoon_time rename across superchain-registry, op-geth, and dependent carveouts #21135, SDM: Update feature toggles when interop hardfork is renamed to lagoon #21129, Centralize the OP fork → implied L1 (Ethereum) fork mapping in the Rust stack #21338.

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Generated by Claude Code

[sebastianst]

It lgtm but will confirm with Interop team.

[ajsutton]

LGTM.