fix(ci): reduce integration test memory usage

[romac]

Closes: #298

Summary

Disable Reth precompile caching for in-process integration nodes. These scenarios
do not exercise precompile caching, and the pinned Reth version reserves a large
cache for every precompile on every node. Avoiding those allocations preserves
the seven-node sync coverage while reducing runner memory pressure.

Also make ArcContext ownership explicit across default and Byzantine feature
builds so Clippy succeeds in both configurations.

Changes

• Disable the Reth precompile cache in the integration node configuration.
• Add a focused assertion for the test-node cache configuration.
• Copy or clone ArcContext according to its feature-dependent ownership semantics.

Testing

• cargo fmt --all -- --check
• cargo nextest run --locked -p arc-test-integration --test-threads 1
• cargo nextest run --locked -p arc-test-integration validators_and_full_nodes_reach_height_3 --test-threads 1
• cargo nextest run --locked -p arc-node-consensus (462 tests)
• cargo clippy --locked -p arc-test-integration --all-targets --all-features -- -D warnings
• cargo clippy --locked -p arc-node-consensus --all-targets --features byzantine -- -D warnings

Additional Context

Reth fixed the oversized precompile-cache reservation upstream in
paradigmxyz/reth#25013. This change avoids that
production-sized cache in integration scenarios while arc-node remains pinned
to Reth v2.2.0.

No breaking changes.

[github-actions]

The latest Buf updates on your PR. Results from workflow Public CI / proto (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Sep 2, 2026, 10:10 AM

[Copilot]

🟢 Approval recommended

The changes are small, well-scoped to integration behavior and feature-gated ownership semantics, and include a direct test assertion for the new configuration.

Pull request overview

This PR reduces CI runner memory pressure during integration tests by disabling Reth’s precompile caching for in-process multi-node test runs, while also adjusting ArcContext ownership handling so Clippy passes under both default and byzantine feature builds.

Changes:

• Disable Reth precompile caching in the integration node NodeConfig to avoid per-node cache allocations.
• Add a unit test asserting the integration node execution config disables the precompile cache.
• Make ArcContext consumption explicit by cloning only in byzantine builds (where it is non-Copy), and moving/copying in non-byzantine builds.

File summaries

File	Description
crates/test/integration/src/runner.rs	Disables precompile_cache_disabled for integration nodes and adds a small assertion test to lock in the behavior.
crates/malachite-app/src/node.rs	Adjusts ArcContext ownership to satisfy feature-dependent Copy/Clone semantics and keep Clippy clean across configs.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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