- Remove useless if-else condition in get_line_style()
  * Use consistent \x1b prefix for all ANSI codes
- Replace magic number 5 with named constant min_reset_color_length
- Use lowercase variable name following naming conventions
- Remove accidentally committed output.txt file

All pre-commit hooks now pass:
✅ ruff (no more RUF034, PLR2004, N806 errors)
✅ cspell (no more unknown words from output.txt)
✅ All other formatting and quality checks

Regenerate comprehensive_output.txt fixture to show correct └─ (corner + horizontal)
instead of │─ (vertical + horizontal) in footer lines.

Changes:
- All 'Return code: 0' footers now use proper └─ corner character
- Maintains consistency with restored BOX_BOTTOM_LEFT constant
- Integration test passes with updated visual appearance

Before: │─ Return code: 0 (debug character)
After:  └─ Return code: 0 (proper corner character)

Add ANSIBLE_DISABLE_WARNINGS=True to test_full_output environment to prevent
Ansible deprecation warnings from varying between environments and versions.

Benefits:
- Prevents test failures due to environment-specific Ansible warnings
- Ensures consistent output across different CI environments and local setups
- Reduces maintenance overhead for fixture updates due to warning changes
- Complements existing WARNING line filtering in sanitization function

Defense-in-depth approach:
1. Primary: ANSIBLE_DISABLE_WARNINGS=True prevents warnings at source
2. Secondary: Sanitization function filters any remaining WARNING lines

This makes the comprehensive test more stable and focused on validating
the command borders feature rather than tracking Ansible deprecation warnings.

…ression

Add ANSIBLE_DEPRECATION_WARNINGS=false alongside ANSIBLE_DISABLE_WARNINGS=True
to provide comprehensive Ansible warning suppression in test_full_output.

This dual approach ensures maximum protection against warnings that could
vary between different Ansible versions and environments:

- ANSIBLE_DISABLE_WARNINGS=True: Disables general warnings
- ANSIBLE_DEPRECATION_WARNINGS=false: Specifically targets deprecation warnings

Benefits:
- Eliminates deprecation warning variations between Ansible versions
- Ensures consistent test output across all environments
- Prevents fixture updates due to deprecation warning changes
- Complements existing WARNING line filtering for complete coverage

This creates a robust triple-layer defense:
1. ANSIBLE_DISABLE_WARNINGS=True (general warnings)
2. ANSIBLE_DEPRECATION_WARNINGS=false (deprecation-specific)
3. Sanitization WARNING line filtering (fallback protection)

Replace ANSIBLE_DISABLE_WARNINGS (not a real env var) with the correct
Ansible warning suppression environment variables:

- ANSIBLE_DEPRECATION_WARNINGS=false (deprecation warnings)
- ANSIBLE_COMMAND_WARNINGS=false (command-specific warnings)
- ANSIBLE_ACTION_WARNINGS=false (action/module warnings)

This provides comprehensive and accurate warning suppression using
Ansible's documented environment variables, ensuring consistent test
output across different environments and Ansible versions.

Benefits:
- Uses officially supported Ansible environment variables
- Provides targeted warning suppression by category
- Maintains test stability and consistency
- Works with existing WARNING line filtering fallback