refactor: enhance error handling and output formatting in Run-Iteration function

refactor: revert model assignment to gpt-5-mini in ralph.ps1

refactor: replace prd.toon with prd.json for task definitions and update references in code and documentation

refactor: update PRD file format and paths, replacing prd.json with prd.toon

docs: add completion message to README for clarity on loop success

docs: update README to clarify loop progress and learnings storage

refactor: update file structure and improve output logging in README

fix: correct file path references from prds.json to prd.json in documentation

refactor: update file paths and improve error handling for PRD validation

add TimeoutSeconds parameter to Run-Iteration function for process management

update acceptance criteria for initialization and tests to include project integration

add Show-Spinner function for improved user feedback during processing

add init