docs: measured model price ledger (docs/model-prices.md)

What GapGPT actually billed per model, with dates and evidence, so a
later price rise can be compared with what it was. gpt-4.1-mini and
gpt-4o-mini were re-checked from the 852 recorded calls in
docs/benchmarks/2026-09-26-tutor-model: every call equals the official
OpenAI per-token price or less (input cache), none more.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -258,6 +258,9 @@ island of every unit. Details in `docs/architecture.md`.
## AI provider notes
**Measured prices live in `docs/model-prices.md`** — a ledger of what GapGPT actually billed per
model, with dates and evidence. When a price changes, add a row there; never overwrite the old one.
`OPENAI_BASE_URL` points at GapGPT (an OpenAI proxy reachable from Iran) and it exposes
~127 models, including reasoning ones. Two failures look alike and must not be treated
alike — `is_account_limit()` in `rag_verify_solutions` is the shared guard: