feat: ramp sequencer header gasLimit toward --builder.gaslimit

[panos-xyz]

Summary

• Sequencer assemble no longer copies parent gasLimit forever. --builder.gaslimit / --miner.gaslimit is now the header GasCeil.
• Each assembled block ramps toward that target by at most ~1/1024 of the parent (same elasticity validators already enforce).
• newSafeL2Block / attributes gas_limit overrides still win, so derivation keeps the imported header value.
• Unset flag keeps current behavior (copy parent). Runtime miner_setGasLimit is not in this PR.

Fixes #156

Test plan

• cargo nextest run -p morph-payload-builder
• cargo check -p morph-node -p morph-payload-builder
• Start a sequencer with --builder.gaslimit 60000000 and confirm successive assembled headers increase toward 60M within the 1/1024 bound

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Reviewing files that changed from the base of the PR and between 1494463 and 8ae2dd4.

📒 Files selected for processing (4)

• README.md
• crates/node/src/components/payload.rs
• crates/payload/builder/src/builder.rs
• crates/payload/builder/src/config.rs

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