refactor(derivation): simplify local verify path, rename Path B to "l…

[curryxbo]

…ocal verify"

• Inline ParseBatchMetadataOnly into fetchBatchInfoOutline; drop the helper. Local verify is new-ABI only: lastBlockNumber from batch.LastBlockNumber, firstBlockNumber from parent header LastBlockNumber + 1. No parentVersion / BlockContexts branching.
• Rename "Path B" -> "local verify" / "Local" across Go symbols, log fields, error messages, Prometheus metric names, CLI default value and Usage string, and tests.
• Trim newly-added local-verify metrics: drop unused LocalVerifyFailed, LocalVerifyFailedByKind, and the three LocalVerifySelfHeal* counters (self-heal not yet implemented). Keep LocalVerifyTriggered as the only signal that the verifier is running.
• Stop zeroing SafeL2BlockNumber gauge on L1 reorg reset; redefine its semantics as the highest verified L2 block watermark to avoid false alarms during reorg recovery.
• Fix stale static_scan_test.go pointing to the renamed verify_local.go.

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