feat(runloop): vendor the eest-runner harness as monad-runloop

[pdobacz]

Sunsets the monad-eest-rust-harness repo. Everything in the diff under monad-runloop is that repo's code, slightly adjusted

Greptile Summary

The PR vendors the runloop harness into this repository and updates the release-consumption workflow to build against the vendored stack.

• Adds the Rust harness, wrappers, builder image, initialization script, and monad-bft submodule under monad-runloop/.
• Updates the workflow to initialize the stack locally and preserve explicitly requested monad-bft and monad-execution overrides.
• Integrates the vendored runner with the Python testing package and project configuration.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/consume_release.yaml	Migrates release consumption to the vendored harness and uses targeted initialization modes that preserve requested stack overrides.
monad-runloop/init-stack.sh	Initializes the nested stack while allowing the workflow to retain an overridden monad-bft or monad-execution checkout.
monad-runloop/build.sh	Builds the vendored Rust harness and Monad execution artifacts through the repository-local builder setup.
packages/testing/src/execution_testing/client_clis/clis/monad.py	Integrates fixture consumption with the newly vendored monad-runloop harness.
monad-runloop/rust-harness/runloop/src/runloop.rs	Vendors the runloop execution orchestration used by the fixture runner.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  Checkout[Checkout execution-specs] --> Init[Initialize pinned monad-bft and monad-execution]
  Init --> BftChoice{monad-bft override?}
  BftChoice -->|Yes| BftOverride[Checkout requested monad-bft]
  BftOverride --> KeepBft[Initialize with --keep bft]
  BftChoice -->|No| ExecChoice{monad-execution override?}
  KeepBft --> ExecChoice
  ExecChoice -->|Yes| ExecOverride[Checkout requested monad-execution]
  ExecOverride --> KeepExec[Initialize with --keep exec]
  ExecChoice -->|No| Build[Build vendored runloop]
  KeepExec --> Build
  Build --> Consume[Consume fixture release]

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_{Reviews (2): Last reviewed commit: "fix(ci): keep stack overrides from being..." | Re-trigger Greptile}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​serde@​1.0.228
	cargo/​serde_json@​1.0.150
	cargo/​alloy-consensus@​2.4.1
	cargo/​alloy-eips@​2.4.1
	cargo/​alloy-primitives@​1.6.0
	cargo/​alloy-rlp@​0.3.15
	cargo/​alloy-signer@​2.4.1
	cargo/​alloy-signer-local@​2.4.1
	cargo/​clap@​4.5.61

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[pdobacz]

Verified to consume tests correctly in https://github.com/monad-developers/execution-specs/actions/runs/33860795778