chore(skills): remove model reference from code-interpreter and problem-solver skills

Author: chinkan

skills/code-interpreter/SKILL.md

@@ -2,7 +2,6 @@
 name: code-interpreter
 description: Execute code snippets and scripts in the sandbox. Supports Python 3 and Node.js. Use for calculations, data processing, file generation, and scripting tasks.
 tags: [code, execution, scripting]
-model: qwen/qwen3-235b-a22b
 tools:
   - read_file
   - write_file

skills/problem-solver/SKILL.md

@@ -2,7 +2,6 @@
 name: problem-solver
 description: Decompose and solve complex multi-step problems. Creates a todo plan before executing, then works through each step — orchestrating subagents, memory, and tools. Inspired by LangChain plan-and-execute agents.
 tags: [orchestration, reasoning, planning]
-model: qwen/qwen3-235b-a22b
 tools:
   - plan_create
   - plan_update