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## ADDED Requirements
### Requirement: Permission error translation helper
The system SHALL provide a `friendlyAPIError` function in the `cmd` package that translates APIError status codes into human-readable messages with operation context.
#### Scenario: Authentication error (401)
- **WHEN** an APIError with StatusCode 401 is passed to friendlyAPIError with operation "create board"
- **THEN** the function SHALL return an error with message "create board: authentication failed — check your API key"
#### Scenario: Permission denied (403) with hint
- **WHEN** an APIError with StatusCode 403 is passed to friendlyAPIError with operation "create board" and permissionHint "requires project manager role"
- **THEN** the function SHALL return an error with message "create board: permission denied (requires project manager role)"
#### Scenario: Permission denied (403) without hint
- **WHEN** an APIError with StatusCode 403 is passed to friendlyAPIError with operation "create project" and empty permissionHint
- **THEN** the function SHALL return an error with message "create project: permission denied"
#### Scenario: Not found (404)
- **WHEN** an APIError with StatusCode 404 is passed to friendlyAPIError with operation "delete board"
- **THEN** the function SHALL return an error with message "delete board: not found — the resource may not exist or you may not have access to it"
#### Scenario: Non-API error
- **WHEN** a non-APIError (e.g., network error) is passed to friendlyAPIError
- **THEN** the function SHALL return the original error unchanged
#### Scenario: Unknown status code
- **WHEN** an APIError with StatusCode 500 is passed to friendlyAPIError
- **THEN** the function SHALL return the original APIError unchanged