Make local RLM REPL concurrency configurable

[snimu]

Description

Make local RLM REPL concurrency configurable, set high default.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

Note

Introduces configurable local REPL concurrency and wires it into the local executor.

• Adds local_repl_max_workers param to RLMEnv.__init__ and documents it
• Sets default to clamp(os.cpu_count(), 1..64) and validates >= 1
• LocalRLMExecutor now constructs ThreadPoolExecutor(max_workers=self.env.local_repl_max_workers)
• No functional changes to sandbox path; only local backend behavior is affected

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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Missing documentation for new configuration parameter

Low Severity · Bugbot Rules

The PR adds a new user-facing parameter local_repl_max_workers to RLMEnv, but the documentation in docs/environments.md is not updated to reflect this. The existing RLMEnv documentation at line 775 describes various configuration options but doesn't mention this new concurrency setting. Per the project's review rules, documentation updates are required when adding user-facing functionality to classes described in docs/.

 

[snimu]

docs for the rlm will have to be properly updated in another PR; right now, it changes so quickly that this doesn't make sense (and a bunch of other args are un-documented as well). Will do this later.