Replace raw ANSI escape codes with Rich library for all human-facing
seedgo CLI output. Adds display.py module with styled components:
header panels, plugin result lines, check items with severity markers,
summary sections, and plugin tables.
- seedgo check: branded header, styled verdicts, hint formatting
- seedgo list: Rich table with bordered columns
- seedgo init: styled success message
- drone_adapter: use direct import instead of parsing CLI output
- Add rich>=13.0 as dependency
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
