docs(review-code): require plain-text terminal output in Phase 5

The skill's chat echo (report, criterion table, verdict, draft summaries) was rendering bold and backtick spans as reverse video, which is hard to read in the terminal. Phase 5 now requires plain text for everything echoed to chat, while the artifact posted to GitHub keeps normal markdown. It's the same constraint as interaction.md's no-reverse-video rule, repeated at the print step where the violation actually happens.

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