fix(gateway): OpenCode Go/Zen session headers, per-model endpoints, max effort, failover - #11
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…ax effort, failover Fixes 12errh#10. - Send stable x-opencode-session + distinct User-Agent on every Go/Zen request (fixes 400 MissingSessionID); mint per-conversation ids so first requests carry it. - Route by model endpoint instead of forcing /chat/completions: new GatewayResponsesAdapter (Responses API) and GatewayMessagesAdapter (Anthropic protocol over gateway base). AnthropicAdapter gained protected hooks; temperature/top_p omitted when thinking is on. - Always maximum reasoning effort on Go/Zen paths (chat: reasoning_effort=max, responses: reasoning.effort=high, messages: max-budget thinking); transparent one-shot retry with low effort on gateway [1210] thinking errors. - Router: immediate failover (no retry) on deterministic 400/401/403/404/410; ERROR-level hint for billing failures (CreditsError/RegionError); lastError recorded on all break paths. - Replace end-of-life NVIDIA default stepfun-ai/step-3.7-flash (410 Gone since 2026-08-28) with live minimaxai/minimax-m3; reasoning-effort hot-reloads via reloadRouter.
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…es, flag DataPolicy - serializeMessages maps null content to '' (strict gateways reject null with 'messages illegal'-class 400s). - Adapters log the exact request body at debug level on non-OK responses so the next 4xx is diagnosable in seconds (nothing at default levels). - DataPolicyError counts as an account failure (console opt-in hint).
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Fixes #10. Ported and rebased onto current main, verified green (typecheck + 402/402 tests, including upstream compaction/fallback suites). What changed and why is in the issue; commit message has the full breakdown.