deploy: multi-backend (minicpm/nemotron/finetuned) + 3-tier ZeroGPU->serverless->local-finetune fallback; finetune pipeline

feat: similar-task recall via Nebius embeddings (keyless; recall degrades off without NEBIUS_API_KEY)

chore: trim dev artifacts from Space (full project on GitHub: art87able/unstuck)

Deploy Unstuck (Codex-built) — initial code