feat(engine): add evaluation runtime tuning

[abhinav-galileo]

Summary:

• Exposes evaluation concurrency as a configurable engine setting.
• Adds Luna HTTP connection and client-pool tuning.
• Preserves Luna HTTP error metadata for evaluator failures.

Validation:

• git diff --check passed for the split diff.
• make engine-test did not reach tests because uv timed out fetching greenlet from the package index.

[codecov]

Codecov Report

❌ Patch coverage is 97.34513% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
engine/src/agent_control_engine/core.py	85.71%	2 Missing ⚠️
.../agent_control_evaluator_galileo/luna/evaluator.py	95.23%	1 Missing ⚠️

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[namrataghadi-galileo]

[client.py:87 / core.py:31 / server] Three divergent env-int parsers across packages

_load_int_env (client.py), _env_positive_int (core.py), and presumably a third in the server package all parse integers from env vars but differ on: empty-string handling, exception type (ValueError vs RuntimeError), and positivity validation. Any fix to one is invisible to the others.

[abhinav-galileo]

For the env parser consistency note: I fixed the immediate Luna parser inconsistency for empty values in 35a12c1. I did not extract a shared env parser across packages in this PR to avoid broadening the runtime-tuning change.

[galileo-automation]

🎉 This PR is included in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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