Block's @owenbjennings fills in the details on @jack's internal memo where he announced Block would be reducing its workforce by nearly 40%: "In the last week of November, or first week of December, things just fundamentally changed. It was with Opus 4.6 and Codex 5.3." "We basically crossed the chasm where [AI tools] were a useful tool to help a given engineer be more productive. You could autocomplete, and so on and so forth." "In late November we got to the point where these agentic…