Write the v3 SDK migration guide

Lena Kruse·Codex VS Code·beacon-docsperf/dashboard-load @ 78e7838·/Users/lena/dev/beacon-docs·2026-09-23 13:05:00 UTC → 2026-09-23 13:05:39 UTC (39s)·gpt-5.6-terra·lena-mbp·/Users/lena/.claude/projects/beacon-docs/e64550ff-68d9-4577-860d-5e2e27b3aa8c.jsonl

12k in / 1.1k out / 1.3M cache read / 14k cache write / 0 thinking·$0.33 API-equiv.·8 messages · 1 user turns · 3 tool calls · 0 sub-agents

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