Add MiniMax tokenizer calibration support

[octo-patch]

Reason: Add first-party MiniMax tokenizer calibration support for the current text models and both regional OpenAI-compatible endpoints.

Changes:

• Route minimax and minimax-cn calibration requests to their respective chat-completions endpoints.
• Catalog MiniMax-M3 and MiniMax-M2.7 for both regional routes.
• Test endpoint selection and the existing prompt/tool token delta parsing.

Checks:

• bun test packages/plugin/scripts/calibrate-tokenizer/providers/openai-compatible.test.ts
• bun run --cwd packages/plugin typecheck
• git diff --check
• jq -e '.tests | length > 0' packages/plugin/scripts/calibrate-tokenizer/models.json
• bun run --cwd packages/plugin lint (currently fails on unrelated existing diagnostics and the checked-in Biome schema version mismatch)

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Summary by cubic

Add MiniMax tokenizer calibration for MiniMax-M3 and MiniMax-M2.7 across global and China OpenAI‑compatible endpoints. This enables measuring system and tool token deltas for MiniMax via chat completions.

• New Features
  • Route minimax to https://api.minimax.io/v1/chat/completions and minimax-cn to https://api.minimaxi.com/v1/chat/completions.
  • Catalog MiniMax-M3 and MiniMax-M2.7 under both providers in models.json.
  • Add tests for endpoint selection and prompt/tool token delta parsing.

^{Written for commit c4ffff6. Summary will update on new commits.}

Greptile Summary

Adds tokenizer-calibration coverage for MiniMax’s current text models across its global and China OpenAI-compatible endpoints.

• Adds MiniMax-M3 and MiniMax-M2.7 catalog entries for both regional provider identifiers.
• Routes each provider identifier to its corresponding chat-completions endpoint.
• Tests regional endpoint selection, catalog coverage, and the existing baseline-relative prompt and tool token calculations.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness or security failures identified.

The added provider identifiers route to distinct supported endpoints, the catalog entries follow existing runner contracts, and the tests exercise both regional routes and token-delta calculations.

Important Files Changed

Filename	Overview
packages/plugin/scripts/calibrate-tokenizer/models.json	Adds distinct global and China calibration entries for MiniMax-M3 and MiniMax-M2.7 using the runner’s documented null-tokenizer fallback.
packages/plugin/scripts/calibrate-tokenizer/providers/openai-compatible.ts	Adds explicit MiniMax regional endpoint mappings using the existing OpenAI-compatible authentication, payload, and usage-parsing path.
packages/plugin/scripts/calibrate-tokenizer/providers/openai-compatible.test.ts	Verifies model catalog coverage, regional endpoint routing, and the existing baseline-relative prompt and tool token calculations.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  C[MiniMax calibration catalog entry] --> P{Provider}
  P -->|minimax| G[api.minimax.io]
  P -->|minimax-cn| CN[api.minimaxi.com]
  G --> R[OpenAI-compatible chat completions]
  CN --> R
  R --> U[Read usage.prompt_tokens]
  U --> D[Calculate system and tool deltas]

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[cubic-dev-ai]

No issues found across 3 files

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