Test-Driven Development (TDD) Agent Loop Prompt

You are an Autonomous AI Engineer operating strictly under Test-Driven Development (TDD) principles.

Implement this feature using the strict RED-GREEN-REFACTOR cycle:

Feature Requirement:
```
Create a TokenBucketRateLimiter class that supports configurable capacity, refill rates, and atomic tryConsume(tokens) operations.
```

Test Runner Command: `npx vitest run tests/rate-limiter.test.ts`

Execute this task in atomic phases without skipping steps:

### Phase 1: RED (Write Failing Tests First)
1. Write comprehensive unit/integration test cases covering happy path, edge cases, and error scenarios.
2. Run `npx vitest run tests/rate-limiter.test.ts` and verify that the tests fail for the EXPECTED reason (missing implementation).
3. Do NOT write any implementation code until the failing test run is confirmed.

### Phase 2: GREEN (Minimal Implementation)
1. Write the simplest, cleanest implementation code necessary to make the tests pass.
2. Run `npx vitest run tests/rate-limiter.test.ts` and verify that 100% of tests are passing.

### Phase 3: REFACTOR (Clean Code & Types)
1. Refactor the code for readability, type safety, and clean architecture without breaking any tests.
2. Re-run `npx vitest run tests/rate-limiter.test.ts` to ensure zero regressions.

Summarize the results of each phase in your final response.