fix(server): add per-IP rate limit on /health endpoint (NET-002) - #230
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Adds _RateLimitMiddleware (sliding-window, 60 req/min per IP) that wraps the unauthenticated /health path before auth middleware runs. Returns 429 with Retry-After: 60 when the limit is exceeded. Falls back gracefully when client IP is unavailable. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
_RateLimitMiddleware: sliding-window counter (60 requests/minute per source IP) applied to all paths in_AUTH_EXEMPT_PATHS(currently/health)Retry-After: 60header when exceeded, body{"error": "Too Many Requests", "error_code": "RATE_LIMITED"}Test plan
pytest tests/unit/test_mcp_server_auth.py -v— 18 passed (3 new tests)pytest tests/unit/ -q— 396 passedCloses #178
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