Feature Updates and Refactor

[kuppulur]

Fixed:

• Renamed --include-unverified to --full-dataset for clarity
• knowledge_graph strategy now auto-generates a .ttl instead of erroring when none exists

Added:

• Copy-CSV-to-clipboard button for HF Spaces, since file downloads are blocked there. Now source code only exists in text2model and not HF
• Local Hugging Face/unsloth model support (gpt-oss-20B, Qwen3, Llama-3.2, Gemma-2) via new text2model[gpu] extra
• --problem-ids now accepts named IDs (e.g. nlp4lp_58), plus new --list-problem-ids and --reasoning-effort flags
• gpt-5.5 / gpt-5.6 model support
• "New Problem" creation + field validation in the dataset editor

Refactored:

• Copilot strategies split out of main.py into individual modules under text2model/copilots/

[skadio]

LGMT, minor comments, the only thing is to talk about Execute Tab UI