v1.2.2 — Disable unreliable infographic download

What changed

Infographic artifact type has been disabled across the entire stack. While generate_infographic() works in the underlying notebooklm-py library, download_infographic() relies on fragile API structure parsing that frequently fails or hangs.

Changes

• MCP Server (tools.py): Infographic requests now return a clear error with guidance to use slides instead
• CLI (notebooklm_client.py): Download method set to None, generate prints stderr warning
• Pipeline (pipeline.py): Removed from default ARTIFACT_TYPES and all method maps
• Documentation: Updated all references from "10 types" → "9 downloadable types" across SKILL.md, AGENTS.md, README (EN/ZH-TW), and api_surface.md

Migration

Replace any infographic usage with slides:

# Before (unreliable)
nlm_generate(notebook="X", type="infographic")

# After (reliable)
nlm_generate(notebook="X", type="slides")

Full Changelog: v1.2.1...v1.2.2