Add mini-swe-agent harness

[xeophon]

Adds the mini-swe-agent composable harness.

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Note

Low Risk
Adds a new experimental harness with scripts that download/install and execute mini-swe-agent; primary risk is around runtime environment assumptions (apt/pip/uv, timeouts, file paths) rather than changes to existing behavior.

Overview
Adds a new mini_swe_agent_harness to the experimental composable harnesses, including a pip/uv-based install script (wheel download with SHA256 verification) and a generated run command that wires task instructions, optional system prompt templating, logging, trajectory output, and timeouts.

Exports the new harness and related helpers/constants from harnesses/__init__.py so it can be selected alongside existing rlm and opencode harnesses.

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[chatgpt-codex-connector]

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