fix(node/sync): fail fast if L2CrossDomainMessenger ABI fails to parse

[curryxbo]

What

node/sync/deposit_log.go parses the L2CrossDomainMessenger ABI at package level but drops the error with a blank identifier:

L2CrossDomainMessengerABI, _ = bindings.L2CrossDomainMessengerMetaData.GetAbi()

If the generated ABI ever failed to parse, L2CrossDomainMessengerABI would be nil and only surface much later as an obscure nil-dereference at first use.

Change

Add an init() that re-checks and panics at startup, so a broken ABI is caught at deploy time rather than deep in request handling. The normal (success) path is unchanged.

Minimal, one file, fmt already imported.

Context

Surfaced by morph-l2/morph-ideas idea #3 (silent error swallowing): https://github.com/morph-l2/morph-ideas/blob/main/idea-003.html

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Review details

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Configuration used: defaults

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Run ID: 3d2e4281-73d0-4415-a428-97abfc05256c

📥 Commits

Reviewing files that changed from the base of the PR and between 21d05b9 and db95c81.

📒 Files selected for processing (1)

• node/sync/deposit_log.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/deposit-log-abi-fail-fast

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