Add unit tests for output-formatter module #364

Description

The output-formatter module in .aios-core/core/utils/output-formatter.js implements PersonalizedOutputFormatter for agent task reports but has no test coverage.

Proposed Changes

• Add 32 unit tests covering:
  • Persona loading from agent YAML blocks with graceful degradation
  • Fixed header, personalized status, output, metrics, and signature building
  • Portuguese verb conjugation (-ar, -er, -ir, -or endings)
  • Tone-based message generation (5 tones)
  • Full format output assembly

Acceptance Criteria

• All 32 tests pass
• No external dependencies required