fix(ci): remove legacy wheel publishing machinery

[pimlock]

Summary

Remove the direct wheel publishing path from GitHub CI so releases only build wheel artifacts and hand off publishing through the existing trigger job.
Clean up the now-unused Artifactory configuration and the python-publish command that supported the old flow.

Related Issue

N/A

Changes

• remove S3 upload and Artifactory publish jobs from release-dev.yml and release-tag.yml
• keep wheel artifact upload and trigger-based publishing intact
• drop the unused PyPI registry config from mise.toml
• remove the unused python-publish subcommand from tasks/scripts/release.py

Testing

• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)
• uv run ruff check tasks/scripts/release.py
• Parsed .github/workflows/release-dev.yml and .github/workflows/release-tag.yml with Ruby YAML

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)