Revert "add model key"

This reverts commit d833cce.

Author: VascoSch92

openhands-sdk/openhands/sdk/subagent/builtins/bash.md

@@ -1,6 +1,5 @@
 ---
 name: bash
-model: inherit
 description: >-
   Command execution specialist (terminal only).
   <example>Run a shell command</example>

openhands-sdk/openhands/sdk/subagent/builtins/explore.md

@@ -1,6 +1,5 @@
 ---
 name: explore
-model: inherit
 description: >-
   Fast codebase exploration agent (read-only).
   <example>Find files matching a pattern</example>