fix(responses): restore parity with chat completions and refactor parsing#21

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PsiACE wants to merge 14 commits intomainfrom

Commits on Mar 1, 2026

fix: restore responses parity across main paths
PsiACE
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refactor: split chat parsing into completion and responses adapters
PsiACE
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fix: align reasoning and stream usage defaults across chat and responses
PsiACE
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refactor: centralize provider compatibility and tool-call normalization
PsiACE
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fix: gate openrouter responses by model and tool context
PsiACE
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refactor: unify transport routing across responses and completion
PsiACE
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refactor: make API format explicit and transport-specific
PsiACE
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refactor: align completion/responses/messages transports across chat/tools/stream
PsiACE
committed