Fix error-handling, improve README/CI#1
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**Problem**: When embedded commands failed, `mdcmd` would crash with a stack trace instead of handling errors gracefully. **Changes**: - Add `CommandError` class to track failed commands without raising exceptions - Modify `async_text()` to catch `CalledProcessError` and return `CommandError` - Update `process_path()` to collect errors and report them to stderr - Update `main()` to exit with code 1 if any commands failed - Add tests for error handling behavior **Behavior**: - Commands that fail no longer crash with stack traces - Failed commands are reported gracefully with exit code and output - Other commands continue to execute in concurrent mode - Exit code 1 when any command fails, 0 when all succeed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Update to use `utz>=0.21.1` which includes the fix for `text()` handling `None` return values from `output()`. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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