combine tag and release actions

[ashleywillard]

🔄 Consolidate Release Workflows

Summary

Merges the separate tag and release workflows into a single, automated release process.

Changes

• Unified Workflow: Combines tag.yml and release.yml into one file
• Auto Versioning: Determines version bump (major/minor/patch) from PR labels
• Automated Process: Creates version commits and tags on PR merge
• Enhanced Security: Uses environment protection and pinned action versions

Benefits

• Single workflow to maintain instead of two
• No manual version bumping required
• Clear semantic versioning via PR labels
• Better security with environment protection

The workflow now automatically handles version bumping, tagging, and releasing when PRs are merged to main.