v1.5.0 - Emoji UX + Prompt Quality Overhaul

Highlights

• Added subtle emoji-enhanced CLI output for high-impact commands with automatic TTY detection.
• Added --plain mode to keep outputs automation-friendly and minimal when needed.
• Introduced a shared presenter layer for consistent status/warning/info rendering.
• Upgraded command prompt UX with canonical /supercodex:* naming and standardized emoji section headers.
• Added prompt quality checklist and expanded tests for output/prompt consistency.

Quality

• Build passes (npm run build)
• Test suite passes (npm test)