docs: add recipe verification levels

[Rockdu]

What

• Define FG, PG, V, and NV evidence levels and classify all nine documented recipes.
• Label every recipe in its model guide and link the policy from the documentation index.
• Mark MiniMax H3 as V: its 2-GPU recipe has a complete curve and no E2E gate; the implementation remains on PR feat: add MiniMax H3 t2va Flow-GRPO support #154.
• Correct the Cosmos3 launch topology and SDE settings to match the shipped 4-GPU recipe.

Why

A completed learning curve, a bit-exact canonical E2E gate, and a scaled proxy gate provide different evidence. The labels make that distinction explicit per recipe instead of implying one status for an entire model family.

Validation

• git diff --check
• Verified the level inventory matches all nine documented recipes: eight scripts on main plus the MiniMax H3 script on PR feat: add MiniMax H3 t2va Flow-GRPO support #154.
• Verified all nine model-guide launch sections have a status label.
• Documentation diagnostics report no errors.

Files

• docs/user-guide/recipe-verification.md — defines the four levels and current inventory.
• docs/index.md — links the policy and disambiguates feature support from recipe verification.
• docs/models/sd3/sd3.md — labels both SD3 recipes.
• docs/models/ltx/ltx2.md — labels the LTX canonical gate.
• docs/models/wan/wan2-2.md — labels the 5-GPU, 17-GPU proxy, and SFT recipes.
• docs/models/qwen-image/qwen-image.md — labels the Qwen-Image recipe.
• docs/models/cosmos/cosmos3.md — labels and corrects the Cosmos3 recipe documentation.
• docs/models/h3/h3.md — labels the MiniMax H3 2-GPU recipe.

Checklist

• pre-commit run --all-files passes — not run; documentation-only change
• Added/updated tests for new behaviour — no runtime behaviour changed
• pytest -x is green — not run; documentation-only change
• If launch flags changed, python3 train.py --help still parses — no launch flags changed
• If a public flag was added, it appears in the CLI reference docs — no public flag added
• If an example was added, it has a real walkthrough — no example added

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