feat(cli): add Color, ConsequenceType, Consequence, ResultReporter

Implements CLI UX normalization infrastructure (Tasks M1.2-M1.5):
- Color enum with 14 ANSI codes (bright + dim variants)
- ConsequenceType enum with 16 tense-aware action types
- Consequence dataclass with nesting support
- ResultReporter class for unified CLI output rendering
- _colors_enabled() for TTY/NO_COLOR detection

Author: LittleCoinCoin