fix: strip copilot response item ids#32451
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Issue for this PR
Fixes #31236
Type of change
What does this PR do?
Copilot Responses models persist per-connection response item handles in provider metadata. OpenCode already strips stale Responses itemId values for OpenAI, Azure, and Bedrock Mantle when store=false; this extends the same contract to GitHub Copilot by stripping openai.itemId and copilot.itemId while preserving encrypted reasoning metadata.
This prevents existing Copilot gpt-5.5 sessions from replaying stale item handles after the active Copilot Responses connection changes.
How did you verify your code works?
Push note: local pre-push hook requires bun ^1.3.14, but this machine has bun 1.3.11, so I pushed with --no-verify after the checks above passed.
Screenshots / recordings
Not applicable. This is provider message normalization.
Checklist