fix(reviewer-bot): align overdue reminders with reviewer state

[PLeVasseur]

Summary

• collect touched PRs when scheduled reviewer-review repair mutates state so repaired items get status-label reprojection in the same maintenance run
• add a shared reviewer-turn model so label projection and overdue reminder logic agree about whether reviewer or contributor currently owes action
• stop reviewer reminders for PRs like [Coding Guideline]: Do Not Depend on Function Pointer Identity #256 where the current reviewer already reviewed the current head, while preserving stale-head and contributor-newer behavior

Testing

• uv run pytest .github/reviewer-bot-tests/test_reviewer_bot.py .github/reviewer-bot-tests/test_main.py
• uv run ruff check --fix

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