fix(provider): widen interleaved reasoning fields (#39556)

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Summary by CodeRabbit

• New Features

  • Expanded support for interleaved reasoning fields, including reasoning_content, reasoning_text, and custom field names.
  • Interleaved settings now accept boolean, direct field-name, or structured formats.
  • Provider normalization now consistently converts field names into the supported structured format.

• Bug Fixes

  • Improved handling of interleaved reasoning configuration across compatible models and providers.
  • Updated API schema validation to reflect the expanded options.

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ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: a4efc953-5da9-4ef6-9ab6-e79be9dc1aa0

📥 Commits

Reviewing files that changed from the base of the PR and between f690c35 and a1ab489.

⛔ Files ignored due to path filters (1)

• packages/sdk/js/src/v2/gen/types.gen.ts is excluded by !**/gen/**

📒 Files selected for processing (5)

• packages/core/src/models-dev.ts
• packages/core/src/v1/config/provider.ts
• packages/opencode/src/provider/provider.ts
• packages/opencode/test/provider/provider.test.ts
• packages/sdk/openapi.json

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📝 Walkthrough

Walkthrough

Interleaved capability schemas now accept booleans, named fields, and arbitrary strings. Provider normalization converts string values into structured fields, with tests covering configured models and models.dev input. OpenAPI definitions reflect the expanded representations.

Changes

Interleaved capability support

Layer / File(s)	Summary
Capability schema contracts packages/core/src/models-dev.ts, packages/core/src/v1/config/provider.ts, packages/sdk/openapi.json	Interleaved values now support booleans, direct field strings, and structured fields, including reasoning_text and arbitrary strings.
Provider capability normalization packages/opencode/src/provider/provider.ts	String interleaved values from models.dev and provider configuration are normalized to { field: ... }.
Normalization test coverage packages/opencode/test/provider/provider.test.ts	Tests cover configured reasoning fields and models.dev normalization to structured interleaved capabilities.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: thdxr, rekram1-node

Poem

A rabbit hops through fields of thought,
Where reasoning strings are neatly caught.
Booleans, names, and objects align,
New texty trails now parse just fine.
Tests thump softly: all is right! 🐇

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

🧪 Generate unit tests (beta)

• Create PR with unit tests

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