Baidu ERNIE / Qianfan (direct)

TENG-2205: Direct Baidu ERNIE (Wenxin Yiyan) API calls via the Qianfan platform, called from customer code. Baidu has no admin or billing API — usage and spend are console-only, in the Qianfan console (console.bce.baidu.com/qianfan). This connector only receives data if the customer's own code emits an OTel span or log record per chat call carrying the attributes below; an uninstrumented integration reports nothing, not zero. LOW CONFIDENCE, stated plainly per TENG-2205 instructions rather than guessed around: Qianfan's documentation is almost entirely Chinese-language, and every attempt to reach Baidu's docs/console domains from this environment this pass returned a connection failure (ECONNREFUSED), so neither the exact base URL nor OpenAI-compatibility could be independently verified live. OpenRouter's catalog does corroborate ERNIE 4.5 model variants exist as an active lab offering, which is the only independent confirmation obtained this pass. OpenAI-compatibility is UNCONFIRMED. Do not assume a generic OpenAI SDK wrapper works against Qianfan's endpoint without first checking Baidu's (Chinese-language) API reference directly. There is no telara-observability SDK wrapper for Baidu/Qianfan. Instrumentation must be manual: hand-written OTel spans around the qianfan SDK call site, emitting the gen_ai.* attributes below. The `spend.currency: USD` below is an ASSUMPTION, not a confirmed fact — Qianfan's console pricing may be denominated in CNY. Confirm against Baidu's live pricing page before populating baidu_ernie.model_price_table with real numbers.