[LinuxDevil]

Fixes audit finding AI-8 (Vercel competitor audit, 2026-10-19).

What was wrong

With a local model (no built-in price) and limits.maxCostUsd set, the run logged a generic once-per-process warning that named neither the model nor the exact fix.

What changed

• The warning now names the model id, says the limit is NOT enforced for it, gives a registerModel({ id, provider, contextWindow, inputCostPerMTok: 0, outputCostPerMTok: 0 }) example and the docs link (https://lousho.com/models-and-cost#models-and-the-price-table, anchor verified live).
• Dedupe is now per model id (still once per process, not per step). The run continues as before (no fail-closed).
• Docs already show the registerModel example, so no docs change.

Tests

• budget.test.ts: asserts text contains model id, NOT enforced, registerModel( and the docs URL, and is emitted once across 3 steps. ollamaCost.test.ts updated to the new text.
• tsc, typecheck:tests, lint, test:coverage (one unrelated tracing.test.ts flake under load; passes alone), fallow exit 0.

Changelog: The unknown-price warning for limits.maxCostUsd now names the model and how to register a price.

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