Add KNIEPUNKT Assistant with multi-LLM editorial workflow

Six-step weekly workflow (research → sources → storyline → draft →
quality → publication) supporting Claude, ChatGPT, Gemini, and Mistral
in parallel for creative steps. Web search via Anthropic tool for news
research. Episode index built from 34 existing KNIEPUNKT episodes for
redundancy checks. Sessions persisted as JSON for mid-workflow resume.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,7 @@
+.venv/
+__pycache__/
+*.pyc
+*.pyo
+episodes_cache.json
+sessions/
+.env