Arclith v0.21.0

What's Changed

• fix: simplify code structure and package adapters by @killiankopp in #190
• fix: reject unknown configuration keys by @killiankopp in #191
• feat: add replayable CLI recipes by @killiankopp in #192
• Propager le contexte de trace dans le runtime LangGraph durable by @killiankopp in #194
• feat: ajouter la capability embedding déterministe by @killiankopp in #195
• feat: ajouter l’adapter embedding OpenAI-compatible by @killiankopp in #196
• chore(release): prepare 0.21.0 by @killiankopp in #197

Full Changelog: v0.20.0...v0.21.0