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* refactor: migrate from /v1/runs to /v1/responses streaming API Replace EventSource-based polling with direct SSE streaming via the /v1/responses endpoint across all server-side callers (chat-run-socket, context-compressor, gateway-client, agent-clients). Messages are now written to DB in real-time during streaming, eliminating post-run sync. Frontend chat store adds tool_call_id tracking for deduplication. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * chore: bump version to 0.5.16 and add changelog - Persist real API usage to usage table on response.completed - Remove unused codex_reasoning_items field from message schema - Fix unused variable warnings in chat-run-socket - Bump version to 0.5.16 - Add changelog entries for 0.5.16 (8 locales) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>