chore: scaffold project files

IDEA.md, SESSION.md, DECISIONS.md, CLAUDE.md, .gitignore.
Next session: invoke writing-plans skill against design spec.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

IDEA.md

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+# IDEA.md — AI Hell
+
+## What is this?
+
+Passive horror webapp. You open it, it slowly destroys your comfort. AI-generated imagery shifts between abstract hellscape and recognizable-but-wrong forms. Audio: ambient dread soundscape with AI-voiced whispers cloned from random non-voice samples. Escalation is infinite — never peaks, always worse, with randomized timing. No avatar, no interaction, no UI. You just watch.
+
+## Problem it solves
+
+Proof of concept for AI-driven horror experience. Explores emergent creepiness from feeding XTTS non-voice samples, SDXL horror imagery, and WebGL shader distortion. Based on claude-avatar infrastructure.
+
+## Constraints / preferences
+
+- Runs on pve197 V100 32GB (~6.5GB VRAM: SDXL 5GB + XTTS 1.5GB)
+- LXC container on pve197 (reuse CT 167 or new CT)
+- Python + FastAPI, single process
+- LAN accessible, reverse proxied via Caddy at hell.sethpc.xyz
+- Hybrid architecture: server generates assets + controls escalation, frontend composites at 60fps via WebGL