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* fix(querier): return proper HTTP status for PromQL timeout errors PromQL queries hitting the context deadline were incorrectly returning 400 Bad Request with "invalid_input" because enhancePromQLError unconditionally wrapped all errors as TypeInvalidInput. Extract tryEnhancePromQLExecError to properly classify timeout, cancellation, and storage errors before falling through to parse error handling. Also make the PromQL engine timeout configurable via prometheus.timeout config (default 2m) instead of hardcoding it. * chore: refactor files * fix(prometheus): validate timeout config and fix test setups Add validation in prometheus.Config to reject zero timeout. Update all test files to explicitly set Timeout: 2 * time.Minute in prometheus.Config literals to avoid immediate query timeouts.