Add format code toolcall

[planger]

PO @eneufeld

Feature: LLM formats code using tool call

Scenario: LLM runs code formatting via tool call
  Given the LLM has access to a tool that formats code
  And the LLM has identified a file that requires formatting
  When the LLM decides to format the code
  Then the LLM triggers the formatting tool call
  And it passes the correct file path as an argument
  And the tool formats the specified file

Don't forget to update the coder prompt and test this