Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Effort dial sweep on one well-specified feature

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  "result": "API-88 is done: the rate limiter is in `src/middleware/rateLimit.js`, wired into `createApp`, and covered by 16 new tests. `npm test` passes all 20 tests (the 4 existing plus 16 new), `npm run lint` is clean, and the suite passed on repeated runs. I haven't committed anything.\n\n**How it works**\n- Each request runs one Lua script in Redis that refills the bucket, takes a token if one is available, and sets the key's TTL. Redis runs a script atomically, so concurrent requests on any instance can't both take the last token.\n- The script reads time from Redis `TIME`, so clock skew between app instances doesn't affect refill.\n- Buckets expire after the time it takes an empty bucket to refill (at least 1 s), so keys don't live forever.\n- Allowed requests get `X-RateLimit-Limit` and `X-RateLimit-Remaining`. Denied requests get 429 with `{\"error\":\"rate_limited\"}`, `Retry-After` (whole seconds, rounded up, minimum 1), and `Remaining: 0`.\n- `createApp({ rateLimit: {...} })` mounts the limiter on `/notes` only, so `/health` is never limited.\n\n**Choices I made beyond the spec**\n- **Fail-open timeout:** Redis can hang without erroring, so each check has a `timeoutMs` (default 200 ms). If it doesn't answer in time, the request goes through.\n- **Known-down short-circuit:** if the ioredis client is `reconnecting`, `close`, or `end`, requests are let through immediately rather than waiting for the timeout.\n- **`onError` option:** fail-open errors are logged to `console.error` by default, and you can pass your own handler.\n- **`keyFn` errors** are passed to `next(err)`, not treated as a Redis failure.\n- **429 also sets `X-RateLimit-Limit`**, for consistency with allowed responses.\n- **Option validation:** `createRateLimiter` throws on a missing `redis`, a non-positive-integer `capacity`, or a non-positive `refillPerSec`.\n- **README** updated to describe the limiter; it previously said Redis wasn't used.\n\n**Not changed**\n- `src/server.js` still calls `createApp({ redis })`, so the limiter is off in the running server until you pass `rateLimit` there. I didn't add env-based config because the ticket didn't ask for it.\n\n**Tests** (`test/rateLimit.test.js`, using `REDIS_URL` with a unique key prefix per test) cover: the 429 path and handler skipping, header values, refill over time, `Retry-After` rounding, per-key buckets, the default `req.ip` key and `rl:` prefix, TTLs, sharing across two app instances, 40 concurrent requests across two instances producing exactly 10 allowed, fail-open on errors, a closed client, and a timeout, `/notes` vs `/health` wiring, option validation, and `keyFn` errors.",
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