GPTModel to HybridModel Migration

Answer-First Migration Guidance

• The canonical source is docs/user-guide/hybrid-model-migration.md.
• Read the canonical document completely before answering, planning, reviewing, editing, converting, or training.
• Keep migration behavior, commands, mappings, prerequisites, limitations, and validation in the canonical document only. Do not duplicate them in this skill.
• This skill adds only what the canonical document does not cover: the mechanical procedure for editing an existing launch script, and the shell hazards that procedure runs into.

Workflow