fix(catalog): restore Mistral model ids from the live /v1/models

[Sy57em1]

Problem

All nine Mistral entries in sources.js return 400 invalid_model, so the whole provider is dead for anyone with a Mistral key.

400  mistral-large-3-25-12
400  mistral-medium-3-5-26-04
400  mistral-small-4-0-26-03
400  ministral-3-14b-25-12
400  ministral-3-8b-25-12
400  ministral-3-3b-25-12
400  mistral-small-creative-25-12
400  magistral-medium-1-2-25-09
403  zai-glm-5-2

The 2026-09-15 audit rewrote the previously working ids into a date-stamped form that La Plateforme does not accept (mistral-medium-3-5 → mistral-medium-3-5-26-04, ministral-14b-2512 → ministral-3-14b-25-12, and so on). Codestral was not touched by that audit, which is why it keeps working on the very same key — a useful signal that the key is fine and the ids are not.

Fix

Every id re-verified against a live GET https://api.mistral.ai/v1/models on a real Experiment-plan key.

Fixed (6):

Before	After
mistral-medium-3-5-26-04	mistral-medium-3-5
mistral-small-4-0-26-03	mistral-small-2603
ministral-3-14b-25-12	ministral-14b-2512
ministral-3-8b-25-12	ministral-8b-2512
ministral-3-3b-25-12	ministral-3b-2512
magistral-medium-1-2-25-09	magistral-medium-latest

Removed (3):

• mistral-large-3-25-12 — no large model exists in the live catalog under any name
• zai-glm-5-2 — absent from /v1/models; a direct call returns 403 tier_not_allowed ("This model is not available in your subscription tier"), so it does not belong in a free catalog
• mistral-small-creative-25-12 — absent from the live catalog

Context windows now come from each model's max_context_length instead of a blanket 256k, which corrects ministral-3b-2512 from 256k to 128k (131072).

Verification

Ping through FCM's own ping() after the change — no 400 left:

200  Ministral 3 14B
200  Ministral 3 8B
200  Ministral 3 3B
429  Mistral Medium 3.5      (free-tier daily limit, burned by this testing)
429  Magistral Medium
429  Mistral Small 4

429 means the id is valid and the model exists; the free tier was simply exhausted while verifying.

npm test → 1154/1154 passing.

One test needed updating: the temperature-clamp test in test/test.js pinned mistral-large-3-25-12 with a comment stating it is a real catalog model. Repointed at mistral-medium-3-5 with a note explaining why.

Notes

docs/providers.md is generated by scripts/generate-provider-table.mjs and still shows the old counts — I left it alone so the regeneration stays a separate, reviewable change.

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