- Renames the `description` field to `tagline` in schema and data files.
- Renames the `full_description` field to `description` in schema and data files.
- Updates all relevant YAML data files, documentation, and templates to reflect these changes.
- Adjusts character limits and descriptions for the new fields.
- Add PR templates for plugins, projects, themes, agents, resources
- Update contributing.md with PR-based workflow and entry templates
- Replace all 'Suggest via Discussion' links with 'Add via PR' links
- Add quick copy templates for each entry type
- Keep existing discussion links for resource entries (they link to content)