TASK-402: Output Formatters

[copyleftdev]

Description

Implement output formats per OUTPUT_FORMAT.md

Phase

Set up development infrastructure with Tiger Style discipline

Test-First Requirements

⚠️ Write tests BEFORE implementation

• Test summary text generation
• Test JSON output (schema validation)
• Test CSV generation
• Test diff output

Acceptance Criteria

• Summary text formatter (human-readable)
• JSON formatter (machine-readable, schema-compliant)
• CSV time-series formatter
• Diff formatter (compare two runs)
• Metadata JSON generation
• Output directory structure per spec
• File I/O with error handling
• UTF-8 encoding validation
• Minimum 2 assertions per function
• >90% test coverage
• All output formats validated
• All tests pass

Dependencies

• TASK-401

Files to Create/Modify

src/output/summary.zig
src/output/json.zig
src/output/csv.zig
src/output/diff.zig
tests/unit/output_test.zig

Estimated Effort

24 hours

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Tiger Style Requirements:

• Minimum 2 assertions per function
• All loops are bounded
• Explicit error handling (no silent failures)
• Code formatted with zig fmt
• Pre-commit hook passes
• All tests pass

[copyleftdev]

Completed in PR #97