Add three high-signal technical essays from Hacker News scan

[rockoder]

As "Scribe", I scanned the top 30 Hacker News posts and analyzed the discourse to identify missing models and senior-level insights.

I synthesized three standalone essays following a mandatory 5-part logical arc:

1. The Vibe-Coding Mirage: Analyzes the shift in B2B SaaS moats from the application layer to the "System of Record" and responsibility layer.
2. The Security-Capability Gap: Explores why major OS platforms are cautious about agentic "Computer Use" due to the "Lethal Trifecta" of scale, liability, and prompt injection.
3. The Plumbing of Volatility: Connects recent market crashes to the mechanical deleveraging of the Japanese Yen carry trade unwind.

Each post includes visual structures (tables/sketches) to improve clarity.
The editorial journal (.Jules/scribe.md) was updated with learnings about the "Software vs. Service" split in industry discourse.

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PR created automatically by Jules for task 7140712090857453941 started by @rockoder

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