feat: update Makefile and README for new linting and testing commands; refactor credential storage to JSON format

feat: add linting and testing commands to Makefile; enhance CLI with new features and tests

fix: runtime issues with plankapy

Update release workflow to use 'uv' for Python setup and add smoke test step

Add 'show' command to display card details including attachments and comments

Remove requirements.txt as dependencies are no longer needed

Refactor code structure for improved readability and maintainability

Ensure executable permissions for the built planka-cli in the Makefile

Update release workflow to use Makefile for building and packaging; add smoke test step

Remove version bump from Homebrew formula update in release workflow

Refactor release workflow and update documentation for Homebrew installation

initial commit