Fix duplicate tool invocations when confirmation required in Claude Code Agent

[Copilot]

Tool invocations were appearing twice in chat when user confirmation was needed: once in "running" state during confirmation, then again as "finished" after execution.

Changes

Push invocations immediately when tool_use blocks arrive

• Modified handleAssistantMessage() to push ChatToolInvocationPart when tool_use blocks are received from Claude
• Track pushed tool IDs in a Set<string> passed through the message processing pipeline

Skip duplicate pushes in tool result handling

• Modified processToolResult() to check if invocation already pushed before creating new one
• Prevents duplicate invocations for same tool ID

Flow change

// Before: push only when result arrives
tool_use → (confirmation) → tool_result → push invocation (duplicate!)

// After: push immediately, skip on result
tool_use → push invocation → (confirmation) → tool_result → skip push

Trade-off

Denied tools will show isConfirmed=true since ChatToolInvocationPart is immutable after push. This is preferable to duplicate invocations appearing in chat.

Original prompt

The claudeCodeAgent is able to get confirmation from the user when they want to run like a terminal command or something. The downside is when on confirmation, the tool call that triggered that confirmation is added to chat in a "running" state but then a new finished tool pops into chat.

In other words we are pushing a new finished tool call the chat rather than completing the existing one. Fix this

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