[Bugfix] Adjust log rate limiting defaults

[dante159753]

What changed

• Increase the default UCM log rate-limit window from 10 seconds to 60 seconds while keeping the three-log limit unchanged.
• Make store health breaker state-transition warnings bypass rate limiting.
• Update logger documentation and regression coverage for both behaviors.

Why

A longer default window reduces repeated log noise. Health breaker transitions are operationally significant state changes, so they must remain visible even when multiple transitions occur within one rate-limit window.

Impact

Rate-limited logs now allow at most three entries per call site in a 60-second window by default. UCM_LOG_RATE_LIMIT_WINDOW_MS can still override the default. Store health breaker transition warnings are always emitted.

Verification

• Commit hooks: codespell, black, and isort passed.
• Direct invocation of all five checks in test/test_logger.py passed.
• python -m pytest test/test_logger.py -q was also attempted, but the Windows test environment stopped in the repository-wide fixture because the Unix-only fcntl module is unavailable.