feat: make action parsing regex configurable

[Chesars]

Summary

Makes the action parsing regex configurable.

Changes

• Add action_regex field to AgentConfig
• Update parse_action() to use self.config.action_regex
• Add documentation with XML example

Usage

agent:
  action_regex: "<action>(.*?)</action>"
  system_template: |
    Use <action> tags for commands.
    <action>ls -la</action>

No breaking changes.

Resolves #144

[klieret]

Thank you for this, especially for also taking care of documentation.

So far we never needed this, but I guess with minimax2 absolutely refusing to do the triple-backtick formatting, this becomes relevant, so let me merge this.

It would also allow us to avoid issues with mini not being able to edit readme files that contain ```bash by switching to another regex without breaking backwards compatibility

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/minisweagent/agents/default.py	97.46% <100.00%> (+0.03%)	⬆️

... and 1 file with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Chesars]

Thank you for this, especially for also taking care of documentation.

So far we never needed this, but I guess with minimax2 absolutely refusing to do the triple-backtick formatting, this becomes relevant, so let me merge this.

It would also allow us to avoid issues with mini not being able to edit readme files that contain ```bash by switching to another regex without breaking backwards compatibility

Hi Kilian. You’re right, and I didn’t know that Minimax2 require another output format for bash commands and it’s true that it will improve mini to edit files in Markdown like ```bash. Thanks to you!