fix: #3004 serve HITL resume tool outputs

[seratch]

This pull request fixes HITL resume handling for server-managed conversations when a single model response mixes approval-gated tool calls with non-approval tool calls. Previously, resume hydration could mark locally generated but unsent tool outputs as already acknowledged by the server, causing the resumed request to omit required function_call_output items and fail with "No tool output found".

This pull request resolves #3004.

Changes:

• Tracks tool call IDs from the interrupted ProcessedResponse and treats matching local outputs as unsent during hydration.
• Wires the non-streaming and streaming resume paths through the same helper.
• Adds regression coverage for preserving the non-approval tool output alongside rejection outputs.