[Test Improver] test: add unit tests for output module (models, formatters, script_formatters)

[danielmeppiel]

🤖 This is an automated PR from Test Improver, an AI assistant that systematically improves test coverage for this repository.

Goal and Rationale

apm_cli/output/ had zero dedicated tests despite containing 1,384 lines of formatting logic used in compilation output. This PR adds 72 tests covering all three output module files:

• output/models.py (122 lines) — data models for compilation results
• output/formatters.py (916 lines) — professional CLI formatter for compilation
• output/script_formatters.py (346 lines) — formatter for script execution output

These formatters are called during every apm compile and apm run execution, making them high-value test targets for catching regressions in user-visible output.

Approach

• Data models (output/models.py): Tests for all properties, edge cases (zero total_dirs, empty sets, negative efficiency improvement), and boundary values.
• CompilationFormatter (output/formatters.py): Tests using use_color=False for deterministic string output. Covers format_default, format_verbose, format_dry_run, and all private formatting helpers (_format_issues, _get_placement_description, _format_coverage_explanation, strategy helpers).
• ScriptExecutionFormatter (output/script_formatters.py): Tests using use_color=False. Covers all public methods including format_compilation_progress (empty/single/multiple), format_execution_success/error, format_subprocess_details, format_auto_discovery_message.

Coverage Impact

Module	Before	After
output/models.py	0%	~95%
output/formatters.py	0%	~60%+
output/script_formatters.py	0%	~80%+

Test Status

72 passed in 0.31s
3235 passed in 12.61s  (full unit suite)

All tests pass. No pre-existing failures.

Reproducibility

uv run pytest tests/unit/test_output_module.py -v
uv run pytest tests/unit tests/test_console.py -x -q

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