Advisor treats `description_llm` / `description_typesafe` as embedder consumers and estimates no API cost for them

[voorhs]

What happens

The advisor classifies description_llm and description_typesafe as embedder consumers: both are in _CACHE_HONORING_MODULES, _EMBEDDER_FORWARD_TRANSFORMER_MODULES and _EMBEDDER_CONSUMING_MODULES (_resource.py:99-117, :601-619). Neither loads an embedder — they call an external API — and the advisor has no notion of an API-cost driver, so the report is wrong in both directions.

autointent-advisor inspect zero-shot-typesafe --n-classes 77 --n-samples 300 --json on fa4df2d2 (zero-shot-typesafe is description_typesafe + the decision node only):

"resource": {"disk_download_gb": 0.0, "disk_cached_gb": 0.91, "ram_gb": 1.80, "vram_gb": 0.0,
             "time_hours": 0.0, "drivers": []}
Verdict: feasible (headroom: ample)

• The 0.9 GB is the default sentence-transformers/all-MiniLM-L6-v2 ("already cached" here; "to download" on a fresh machine) and the RAM includes _embedder_load_ram_gb for it — a model the preset never loads.
• drivers: [], time_hours: 0.0: nothing about the actual cost — the number of API calls (≈ unique utterances of train_1 + validation + test, × question types for typesafe, thanks to the answer cache), their price, or the wall-clock at max_concurrent/max_per_second. Measured in Zero-shot jev vs GPT-6 vs classic-light Darinochka/AutoIntent-experiments#43: description_llm on gpt-6 via OpenRouter ≈ $2.5–3.1 and ~10 s per 100 utterances; description_typesafe ≈ $0.01–0.02 per 100.
• No preflight finding that the arm needs an API key in the environment (OPENAI_API_KEY / TYPESAFE_API_KEY), which is the thing that actually fails on a fresh machine.

Proposed

A third module class next to "embedder consumer" / "trainer": API scorer — no embedder, VRAM or model disk; an api driver row with the estimated call count (from the split sizes and, for typesafe, the number of question_type values in the search space), the configured rate limits → wall-clock, and cost: not estimated (external API, provider pricing) rendered explicitly rather than as $0/"ample"; plus a preflight check for the key env var.

Follow-up from #350.