opencode 1.18.27 raises default provider and stream timeouts to five minutes and gates Anthropic thinking blocks to Claude 5.1+

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Released 2026-09-02T21:41Z under the anomalyco org (the sst/opencode path still redirects there after last week's rename). Provider header timeouts and streamed chunk timeouts both now default to five minutes so slow model startups fail less often, with `false` supported to disable chunk timeouts entirely. Anthropic `thinking.blockBinding` is now limited to Claude 5.1+ models because older deployments were rejecting the requests outright, and community PR #46820 adds a config opt-out for anyone who needs the provider default back.