Refactor reviewer-bot runtime context interface

[PLeVasseur]

Summary

• introduce an explicit runtime context protocol for the core extracted reviewer-bot infrastructure modules
• type the central infrastructure modules against that protocol instead of relying on a purely implicit bot contract
• remove one leftover dynamic queue wrapper and add a structural regression test for the context surface

What Changed

• add scripts/reviewer_bot_lib/context.py with a ReviewerBotContext protocol for the core runtime service surface
• annotate the core infrastructure modules against that protocol:
  • scripts/reviewer_bot_lib/app.py
  • scripts/reviewer_bot_lib/github_api.py
  • scripts/reviewer_bot_lib/state_store.py
  • scripts/reviewer_bot_lib/lease_lock.py
• remove the unused sync_members_with_queue_wrapper() dynamic queue helper
• add a regression test asserting that the main reviewer-bot module satisfies the runtime context protocol

Validation

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

Notes

• this PR is intended to make the runtime service contract explicit; it should not change reviewer-bot semantics
• follow-up slices can now narrow the lock/state layer and continue shrinking the facade against an explicit interface

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