Release v1.0.0 - MVP

First stable release of the asdf plugin.

Features:
- Version listing from upstream releases
- Download and install from official sources
- PMPL-1.0 licensed
- Comprehensive README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

fix: update ShellCheck to use -x flag and exclude SC1091

- Add -x flag to follow sourced files
- Exclude SC1091 (not following external source) as it's expected

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>