fix: filter Ollama models without native tool support

[daniel-lxs]

Summary

Fixes an issue where Ollama models without native tool support (like qwen2.5-coder:7b) would output tool-call JSON as text instead of triggering native tool calls, causing an infinite loop with the error: "The model provided text/reasoning but did not call any of the required tools."

Root Causes

1. Missing Capability Detection: parseOllamaModel() wasn't checking if models report "tools" in their capabilities array
2. Missing tool_call_end Events: NativeOllamaHandler emitted tool_call_partial chunks but never emitted tool_call_end events

Solution

1. Filter out models without "tools" capability in parseOllamaModel() - returns null for incompatible models
2. Emit tool_call_end events after streaming completes in NativeOllamaHandler

Files Changed

• src/api/providers/fetchers/ollama.ts - Added capability checking in parseOllamaModel
• src/api/providers/native-ollama.ts - Added tool_call_end emission
• src/api/providers/fetchers/__tests__/ollama.test.ts - Updated tests with tools capability
• src/api/providers/__tests__/native-ollama.spec.ts - New test for tool_call_end events

Testing

• ✅ 13/13 tests pass in ollama.test.ts
• ✅ 15/15 tests pass in native-ollama.spec.ts
• ✅ Full test suite: 5242 tests pass

Linear Issue

COM-487

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Important

Fixes Ollama model handling by filtering models without tool support and ensuring proper event emissions.

• Behavior:
  • parseOllamaModel() now filters out models without "tools" capability, returning null for such models.
  • NativeOllamaHandler emits tool_call_end events after streaming completes.
• Files Changed:
  • ollama.ts: Added capability checking in parseOllamaModel().
  • native-ollama.ts: Added tool_call_end emission.
  • ollama.test.ts and native-ollama.spec.ts: Updated tests to cover new behavior.
• Testing:
  • All tests pass, including new tests for tool capability and event emissions.

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[roomote]

Rooviewer   See task on Roo Cloud

Reviewed the changes. This PR correctly addresses the infinite loop issue by:

1. Filtering out Ollama models without native tool support ("tools" capability)
2. Emitting tool_call_end events after streaming completes in NativeOllamaHandler

The implementation follows established patterns from other providers and has comprehensive test coverage. No issues found.

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