Add new resource file for loop and substrate project page

- Introduce .sisyphus/ralph-loop.local.md with iteration settings and completion promise
- Add src/content/projects/substrate.mdx describing AI‑powered texturing suite

Hubert The Eunuch

.sisyphus/ralph-loop.local.md

@@ -0,0 +1,9 @@
+---
+active: true
+iteration: 1
+max_iterations: 100
+completion_promise: "DONE"
+started_at: "2026-01-03T03:44:54.441Z"
+session_id: "ses_47e0ab7d0ffeVYIumRnRO0IG1n"
+---
+Complete the task as instructed

src/content/projects/substrate.mdx

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+---
+title: "Substrate"
+description: "A texturing suite for 3D artists featuring AI-powered PBR material generation in UV space using a custom diffusion model. The landing page is built with Astro 5, Lenis, TypeScript, and React, while the core texturing application runs on Next.js."
+link: "https://substrate.biohazardvfx.com/"
+category: "VFX/Creative Tool"
+tags:
+  - "Astro 5"
+  - "Next.js"
+  - "React"
+  - "TypeScript"
+  - "Lenis"
+  - "AI/ML"
+  - "PBR Materials"
+order: 4
+---