add: Hosted generation for the Space, and retire the ZeroGPU attempt

fix: Don't let a half-loaded Embedder look like a loaded one

fix: Unpin the Space's transformers -- the pin made the build unsolvable

add: A CUDA path for the demo Space, behind the existing engine contract

fix: Move the retrieval index out of git and onto the Hub

fix: Three silent retrieval bugs, and bridge in 88% of the corpus

fix: Enforce parameter provenance, fix rendering/citations, add tools, harden agent loop

fix: Make pypdf lazy import and use requirements.txt in Colab Step 1

fix: Simplify Colab notebook, fix rank_bm25 import handling, and clean up prompts

feat: Initial open-source release of ControlAI