Streaming ToolOutput events omit the tool-call ID

[MitulShah1]

Priority: P3 · Nature: unfinished field

Problem

stream_with_result.go:436 emits tool-output events with an empty ID:

ToolOutput: &ToolOutput{
    ToolCallID: "", // Would need to track this

The ID is available in recordedToolCalls[i].

Impact

Consumers of StreamWithResult cannot correlate tool outputs back to their originating tool calls.

Fix

Pass recordedToolCalls[i].ID through to the event.

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Filed from a full-repo audit (branch main). Verified against source; baseline go vet/staticcheck/go test -race pass on the default build.