fix: prevent duplicated tool call rendering in parallel execution

[daniel-lxs]

Problem

Fixes a race condition where the first tool in a parallel batch could be presented twice due to tools retaining partial=true after finalization.

Changes

• Explicitly marks all tool_use blocks as non-partial after finalization completes

Testing

⚠️ Not yet tested - This is a draft PR for review and discussion.

Related

• Fixes EXT-634
• Related to the parallel tool calling feature (EXT-629)

[roomote]

Rooviewer   See task on Roo Cloud

I've reviewed this PR and found no issues. The implementation looks sound:

• The main fix (marking all tool_use blocks as non-partial after finalization) correctly prevents the race condition that caused duplicated tool rendering
• The fix is well-placed after finalizeRawChunks() and catches edge cases where toolUseIndex was undefined or finalizeStreamingToolCall returned null
• The CI/CD workflow changes add reasonable improvements (concurrency, lint/type-check/build steps)
• The Cerebras provider config change adds temperature support

Note: The PR is marked as a draft with "Not yet tested" - consider adding integration testing before merging.

Previous reviews

• d0a45a9: Review #1
• d0a45a9: Review #2
• e621c39: Review #3

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

[roomote]

🔄 Review in Progress - View Job

Summary

✅ No issues found - The PR is ready for approval.

Changes Reviewed

This PR fixes a race condition where the first tool in a parallel batch could be presented twice due to tools retaining partial=true after finalization. It also implements new_task isolation logic to prevent orphaned tools when delegation disposes the parent task.

Key Changes:

1. Task.ts (lines 3286-3295): Explicitly marks ALL tool_use and mcp_tool_use blocks as non-partial after finalization, preventing the double-presentation race condition.
2. Task.ts (lines 3433-3466): Implements new_task isolation enforcement - truncates subsequent tools when new_task is called alongside other tools and injects error tool_result blocks.
3. presentAssistantMessage.ts (line 878): Adds checkpoint save before new_task execution to ensure state is saved before delegation.
4. NewTaskTool.ts: Removed checkpoint logic (moved to presentAssistantMessage.ts).
5. new-task-isolation.spec.ts: New comprehensive test file for new_task isolation enforcement.

TODO

• Verify existing comments against current code
• Review changes and enumerate net new issues
• Submit comments
• Summarize issues flagged and update top-level comment
• Approve the pull request

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[daniel-lxs]

Note: There are still concerns about the task.ask() method design being fragile when multiple asks of the same type occur in quick succession. This catch-all approach should handle the immediate race condition, but will do further testing to verify edge cases.

[roomote]

The changes look correct. The PR properly fixes the race condition where tools could retain partial=true after finalization, and implements proper new_task isolation to prevent orphaned tools when delegation disposes the parent task. The test coverage is comprehensive.

[hannesrudolph]

Tested. LGTM