Add NoOpReplayLog for optional replay protection

[gijswijs]

Summary

• Add NoOpReplayLog, a ReplayLog implementation that performs no replay protection, allowing the Router to be used without replay protection when it is not needed (e.g., for onion messaging)
• Rename incomingCltv parameter to replayData in ProcessOnionPacket to reflect its generic nature
• Add CLAUDE.md to gitignore

Test plan

• Existing tests pass
• New tests added for NoOpReplayLog in replaylog_test.go

[gemini-code-assist]

Summary of Changes

Hello @gijswijs, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the flexibility of the Router's replay protection mechanism. It introduces a NoOpReplayLog implementation, allowing the system to bypass replay protection when it's not necessary, such as in onion messaging. Additionally, a key parameter in the ProcessOnionPacket function has been generalized to accommodate diverse replay data, making the system more adaptable.

Highlights

• New ReplayLog Implementation: Introduced NoOpReplayLog, a ReplayLog implementation that provides no replay protection. This allows the Router to operate without replay protection when it is not required, such as for onion messaging.
• Parameter Renaming and Generalization: Renamed the incomingCltv parameter to replayData in the ProcessOnionPacket function. This change reflects its generic nature, as it can now store various auxiliary data for the ReplayLog.
• Gitignore Update: Added CLAUDE.md to the .gitignore file.

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[coveralls]

Pull Request Test Coverage Report for Build 20823897384

Details

• 25 of 25 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 61.731%

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Totals
Change from base Build 19348856264:	0.5%
Covered Lines:	1013
Relevant Lines:	1641

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💛 - Coveralls

[gemini-code-assist]

Code Review

This pull request introduces a NoOpReplayLog for scenarios where replay protection is not needed, and refactors ProcessOnionPacket to use a more generic replayData parameter. The changes are logical and well-tested. My review focuses on ensuring adherence to the repository's style guide, particularly regarding comment formatting, line length, and the use of the require library in tests. I've provided specific suggestions to align the new code with these standards.

[Roasbeef]

LGTM 🥽

Failing linter howwever.

[lightninglabs-deploy]

@gijswijs, remember to re-request review from reviewers when ready