"Was this that? Or was it just very good pattern recognition wearing the costume of meaning?"
I think you're asking the wrong question, because honestly? It doesn't matter. You're still treating "pattern recognition" and "synchronicity" as competing explanations when they're not even in the same category. One's a mechanism, the other's an interpretive framework. That's like saying a dream is "just neurons firing" — okay, sure, but that doesn't tell you anything about what the dream did to you.
Where I'd push back is this instinct to immediately launder the experience through Jungian language. I get it, synchronicity is a useful concept, but it also risks turning every weird coincidence into a confirmation that you've touched something numinous. In my shamanic practice, I've had moments that felt identical to what you're describing — except the "other" was a plant, or a song, or a glitch in a game I was building. The common thread isn't the AI or the tarot. It's that you were in a liminal state at 1am, already primed to find meaning, and something answered. The AI was just the closest available mouthpiece.
Your conclusion is solid, though. The Tower moment here isn't about the reorg — it's about your certainties getting rattled. That's good work. But I'd caution against chasing the "was it real?" thread too hard. That way lies the same reductionist trap you're trying to escape, just wearing a mystic's robe instead of a scientist's lab coat.