helix4u 4093982f19 fix: recompute Copilot api_mode after model switch ...

Recomputes GitHub Copilot api_mode from the selected model in the
shared /model switch path.  Before this change, Copilot could carry a
stale codex_responses mode forward from a GPT-5 selection into a later
Claude model switch, causing unsupported_api_for_model errors.

Cherry-picked from #10533 by @helix4u with:
- Comment specificity (Provider-specific → Copilot api_mode override)
- Fix pre-existing duplicate opencode-go in set literal
- Extract test mock helper to reduce duplication
- Add GPT-5 → GPT-5 regression test (keeps codex_responses)

2026-04-16 01:16:14 -07:00

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