Add reader, versioning, and export tools

Rename completion UI to segments

Cap auto-context by TPM and add Russia notes

Lock completion UI to OpenAI

Fix model_name initialization for auto-context packing

Auto-pack full context and support writing requests

Simplify completion UI

Normalize pasted OpenAI API keys

Clarify page navigation and API key usage

Make sidebar navigation more visible

Improve Shadow Space manuscript workflow

Add Hugging Face Space configuration to README

Add all manuscript Markdown files

Add manuscript Markdown files

Initial commit: Shadow of Lillya project (Markdown files only, no binaries)