Move & rename MONAD_NEXT to MONAD_NINE

[pdobacz]

Rename to match category-labs/monad#2112

[greptile-apps]

Greptile Summary

This PR performs a mechanical rename of the MONAD_NEXT fork to MONAD_NINE across the entire codebase (60 files), moving the fork module from src/ethereum/forks/monad_next/ to src/ethereum/forks/monad_nine/ to align with the upstream monad repository (category-labs/monad#2112). The change is purely a rename — no logic, behaviour, or fork criteria are modified.

Key changes:

• Renamed the monad_next Python package directory to monad_nine (module files moved via git rename)
• Updated all MONAD_NEXT class/identifier references to MONAD_NINE across testing harness, spec tools, and tests
• Updated EXCEPTION_MAPS, CI fill-params, and README documentation to use the new name
• No remaining references to monad_next or MONAD_NEXT found in the codebase

Issue found:

• The docstring on MONAD_EIGHTToMONAD_NINEAtTime15k in transition.py still reads "Prague to MONAD_NINE transition" — it should say "MONAD_EIGHT to MONAD_NINE transition". This was a pre-existing inaccuracy carried forward from the old name.

Confidence Score: 5/5

• This PR is safe to merge — it is a purely mechanical rename with no logic changes and the rename is complete across all 60 files. One minor docstring inaccuracy was found but does not affect functionality.
• All occurrences of MONAD_NEXT/monad_next have been replaced with MONAD_NINE/monad_nine. No functional code paths, fork criteria, or test assertions were altered. The single issue found is a pre-existing docstring inaccuracy ("Prague to MONAD_NINE" should be "MONAD_EIGHT to MONAD_NINE") that was carried forward during the rename. This is easily fixable and does not impact the mechanical correctness of the rename itself.
• packages/testing/src/execution_testing/forks/forks/transition.py (minor docstring fix at line 67).

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    EIGHT[MONAD_EIGHT]
    NINE[MONAD_NINE]
    TRANS[MONAD_EIGHTToMONAD_NINEAtTime15k\ntransition fork @ ts=15000]

    EIGHT -->|inherits| TRANS
    TRANS -->|transitions to| NINE

    subgraph "Fill Range"
        EIGHT -.->|--from| FILL[fill params]
        NINE -.->|--until| FILL
    end

    subgraph "Renamed in this PR"
        OLD["monad_next / MONAD_NEXT"] -. "→" .-> NINE
    end

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[greptile-apps]

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[QEDK]

LGTM.