Function find_bean_file 

pub fn find_bean_file(beans_dir: &Path, id: &str) -> Result<PathBuf>

Find a bean file by ID, supporting both new and legacy naming conventions.

Searches for bean files in this order:

1. New format: {id}-{slug}.md (e.g., “1-my-task.md”, “11.1-refactor-parser.md”)
2. Legacy format: {id}.yaml (e.g., “1.yaml”, “11.1.yaml”)

Returns the full path if found.

Examples

• find_bean_file(beans_dir, "1") → .beans/1-my-task.md or .beans/1.yaml
• find_bean_file(beans_dir, "11.1") → .beans/11.1-refactor-parser.md or .beans/11.1.yaml

Arguments

• beans_dir - Path to the .beans/ directory
• id - The bean ID to find (e.g., “1”, “11.1”, “3.2.1”)

Errors

• If the ID is invalid (empty, contains path traversal, etc.)
• If no bean file is found for the given ID
• If glob pattern matching fails