fix(ingest): count TypeScript ADK's call_llm as the model call - #1170

🟢 Confidence 4/5 · likely safe to merge
Contained to one vendor's stamping, and the Python and TypeScript paths each have a test that FAILs against the old guard.
_{quality 100/100 · no findings · tests covered · risk medium}

Drops the google_adk + call_llm early-out in is_model_call so the operation decides, letting TypeScript ADK's call_llm (stamped chat) be the model call while Python's wrapper still is not. Safe to merge; both dialects are covered by tests.

• is_model_call no longer short-circuits on google_adk spans named call_llm
• ADK call_llm with gen_ai.operation.name=chat now stamps buckets and maple_ai.llm_call=1
• New google_adk_ts_call_llm_owns_usage test pins the TypeScript path

_{9a516c1 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}