Making Maru work without an L2 EL node

[Filter94]

Fixes #442

---

Note

Allows Maru to operate without a local EL by making EL config optional, introducing fork-transition.l2-eth-api-endpoint, and updating factories/sync to work when EL is absent, with new tests and Helm/docker configs.

• Config:
  • Make validatorElNode optional; add fork-transition with l2-eth-api-endpoint and protocol-transition-polling-interval.
  • Rename Linea fields to l1EthApiEndpoint and add required l2EthApiEndpoint; DTO/back-compat and validations updated.
  • Update TOML loaders, defaults, and tests accordingly.
• App/Factory:
  • Accept nullable EL clients; expose apiPort(); close clients conditionally.
  • Create EL manager map only when validator EL is configured; EL sync becomes optional via NoOpLongRunningService.
  • Add checkL2EthApiEndpointAndForks and wire forkTransition interval.
• Consensus/Sync:
  • DifficultyAwareQbftFactory takes optional Web3j; require presence on create; ProtocolStarter uses onBeaconSyncComplete.
  • SyncController.create refactored to accept elSyncServiceFactory instead of concrete handlers.
• Follower without EL:
  • QbftFollowerFactory imports payload to EL only if client exists and validates conditionally.
  • New integration test MaruFollowerNoElTest verifies block import without EL.
• Helm/Docker:
  • Move EL JSON-RPC URLs to [fork-transition]; remove eth-api-endpoint from [payload-validator].
  • Update chaos-testing values and docker/maru/config.dev.toml accordingly.
• Build/CI:
  • Add test dependency in app/build.gradle; fix p2p testFixtures; bump azure/setup-helm to v4.3.1.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.26966% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.39%. Comparing base (2f9071c) to head (edae720).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...src/main/kotlin/maru/config/HopliteTomlFriendly.kt	74.28%	4 Missing and 5 partials ⚠️
app/src/main/kotlin/maru/app/MaruAppFactory.kt	87.71%	7 Missing ⚠️
config/src/main/kotlin/maru/config/Config.kt	80.00%	2 Missing and 2 partials ⚠️
...tils/src/main/kotlin/testutils/maru/MaruFactory.kt	90.62%	3 Missing ⚠️
app/src/main/kotlin/maru/app/MaruApp.kt	80.00%	0 Missing and 2 partials ⚠️
.../kotlin/maru/consensus/qbft/DifficultyAwareQbft.kt	50.00%	1 Missing and 1 partial ⚠️
...pp/src/main/kotlin/maru/app/QbftFollowerFactory.kt	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #451      +/-   ##
============================================
+ Coverage     83.20%   83.39%   +0.18%     
- Complexity      978     1010      +32     
============================================
  Files           212      213       +1     
  Lines          7223     7328     +105     
  Branches        513      548      +35     
============================================
+ Hits           6010     6111     +101     
+ Misses          926      916      -10     
- Partials        287      301      +14     

Flag	Coverage Δ
kotlin	83.39% <84.26%> (+0.18%)	⬆️

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[fluentcrafter]

@Filter94 please chek the regression tests

[Filter94]

@fluentcrafter The PR is not ready to merge yet

[fluentcrafter]

These 2 functions have a significant code duplication, can we improve that?

[fluentcrafter]

Aslo it looks like we can avoid some suplication here...

[Filter94]

I made some improvements, please check