fix(claude): add MiniMax models to the picker

[octo-patch]

Reason: Add the configured MiniMax Claude-compatible models to the picker.

What changed

• add MiniMax/MiniMax-M3 and MiniMax/MiniMax-M2.7 to the Claude Code curated model list used by the Next.js app
• keep the CLI-side agent registry in sync with the same curated model entries
• add focused tests that assert both MiniMax model ids remain available in the Claude picker

Checks

• pnpm --dir cli test -- src/__tests__/agents-detect.test.ts
• pnpm --dir next test -- src/lib/agents/__tests__/detect.test.ts

[mrcfps]

@octo-patch The MiniMax M3 and M2.7 model entries are kept in sync across the Next.js and CLI Claude registries, and the new coverage verifies both picker lists. I also verified the workspace guard, both package typechecks, all unit tests, and both production builds; everything passes. Thanks for the focused, well-tested fix! 🙌

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