Add NewAdaptiveRateLimiterWithWindow constructor for test-only refactor:
- Production code uses NewAdaptiveRateLimiter with default 30s window
- Tests can inject shorter durations (e.g., 100ms) for fast execution
- No behavior changes to production rate limiting logic
Acceptance criteria:
- NewAdaptiveRateLimiterWithWindow accepts configurable window duration
- Production callers continue using default 30s window
- Tests can inject millisecond-scale windows for fast iteration
- No changes to rate limiting logic or defaults
Co-Authored-By: Claude <noreply@anthropic.com>
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