roofactor: Migrate Roo provider to AI SDK

[hannesrudolph]

Summary

Migrates the Roo provider from the legacy BaseOpenAiCompatibleProvider (raw OpenAI SDK streaming) to AI SDK, completing the last production provider migration. Deletes the now-orphaned legacy base class.

Changes

• src/api/providers/roo.ts — Full rewrite (435→327 lines):

  • Extends BaseProvider + SingleCompletionHandler (was BaseOpenAiCompatibleProvider)
  • Uses createOpenAICompatible() from @ai-sdk/openai-compatible + streamText/generateText from ai
  • Per-request provider factory (createRooProvider()) with fresh session token
  • Reasoning config sent via transformRequestBody callback
  • Custom headers (X-Roo-App-Version, X-Roo-Task-ID) via provider config
  • Protocol-aware token normalization (getApiProtocol) preserved
  • Server-side cost from providerMetadata.roo.cost with client-side fallback
  • isAiSdkProvider() returns true (critical for reasoning parts preservation)
  • generateImage() and dynamic model loading preserved unchanged

• src/api/providers/__tests__/roo.spec.ts — Full test rewrite (45 tests):

  • Mocks ai and @ai-sdk/openai-compatible instead of openai
  • Tests reasoning config via transformRequestBody
  • Tests reasoning details accumulation, usage/cost, tool calls, headers

• src/api/providers/base-openai-compatible-provider.ts — Deleted (legacy base class, 0 remaining consumers)

• src/api/providers/__tests__/base-openai-compatible-provider.spec.ts — Deleted

• src/api/providers/__tests__/base-openai-compatible-provider-timeout.spec.ts — Deleted

---

Important

Refactors RooHandler to use AI SDK, removing legacy base class and updating tests.

• Behavior:
  • Migrates RooHandler in roo.ts from BaseOpenAiCompatibleProvider to AI SDK.
  • Uses createOpenAICompatible() and streamText/generateText for handling requests.
  • Adds createRooProvider() for per-request provider creation with session token.
  • Preserves generateImage() functionality.
• Tests:
  • Rewrites roo.spec.ts to mock AI SDK instead of OpenAI.
  • Tests include reasoning config, tool calls, and headers.
• Removals:
  • Deletes base-openai-compatible-provider.ts and its tests as they are no longer used.

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[roomote]

Rooviewer   See task

No issues found. The latest commit adds stream-error resilience (matching the established consumeAiSdkStream pattern) and replaces the as any tool choice cast with the typed mapToolChoice utility. The previously flagged cost bug remains fixed.

• roo.ts: calculateApiCostOpenAI receives already-normalized (non-cached) inputTokens for Anthropic-protocol models, causing cache tokens to be double-subtracted in the fallback cost calculation

Previous reviews

• 1c66ae3: Review #1
• 6af1754: Review #2

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}