feat(config): support global local override via runok.local.yml

[fohte]

Why

• Users who manage their global config in dotfiles via git have no place to add machine-specific rules (e.g. allowing internal tools) at the global level
  • Project-local config has runok.local.yml for personal overrides, but the global config lacked an equivalent mechanism

What

• Auto-load ~/.config/runok/runok.local.yml (or .yaml) as a global local override
  • Merge priority: global < global local override < project < project local override

---

[gemini-code-assist]

Summary of Changes

Hello @fohte, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses the need for machine-specific global configuration overrides, similar to how project-local overrides function. It introduces a new runok.local.yml (or .yaml) file at the global level, allowing users to manage personal or machine-specific settings without impacting their main global configuration, especially useful for those managing global configs via version control. The changes ensure these new overrides are loaded and merged correctly within the existing configuration hierarchy.

Highlights

• Global Local Override Configuration: Introduced support for a global local override configuration file, ~/.config/runok/runok.local.yml (or .yaml), allowing users to define machine-specific rules that override global settings without modifying their main global configuration.
• Configuration Merge Priority: Updated the configuration loading mechanism to incorporate the new global local override. The new merge priority is: global < global local override < project < project local override.
• Configuration Loader Enhancements: Modified the DefaultConfigLoader to store the global configuration directory and added a new private method to determine the path for the global local override file, preferring .yml over .yaml.
• Comprehensive Test Coverage: Added extensive unit tests to validate the correct loading, merging, and priority of the new global local override configuration, including scenarios for file preference and error handling.

Changelog

• src/config/loader.rs
  • Added global_config_dir field to DefaultConfigLoader to store the directory for global configuration files.
  • Modified DefaultConfigLoader::new and DefaultConfigLoader::with_global_path to correctly initialize global_config_dir.
  • Implemented global_local_override_config_path method to locate runok.local.yml or runok.local.yaml in the global config directory.
  • Integrated the loading of the global local override configuration into the ConfigLoader::load method.
  • Adjusted the configuration merging logic to apply global local overrides after global configuration but before project-specific configurations.
  • Added a write_global_local helper function to TestEnv for writing global local override files in tests.
  • Introduced several new test cases to verify the functionality, priority, and error handling of the global local override feature.

Activity

• No human activity has been recorded on this pull request yet.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.93%. Comparing base (10c9e9c) to head (1032760).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   89.82%   89.93%   +0.11%     
==========================================
  Files          29       29              
  Lines        6242     6332      +90     
==========================================
+ Hits         5607     5695      +88     
- Misses        635      637       +2     

Flag	Coverage Δ
Linux	89.78% <100.00%> (+0.11%)	⬆️
macOS	91.87% <100.00%> (+0.12%)	⬆️

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