Add dependency management to issue workflows

Updated skills and commands to identify and formally link issue
dependencies using tea CLI:

Skills updated:
- issue-writing: Document deps in description + link with tea CLI
- backlog-grooming: Check for formal dependency links in checklist
- roadmap-planning: Link dependencies after creating issues

Commands updated:
- create-issue: Ask about and link dependencies for new issues
- plan-issues: Create in dependency order, link with tea issues deps add
- groom: Check dependency status, suggest missing links

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

commands/plan-issues.md

@@ -43,6 +43,6 @@ argument-hint: <feature-description>
    - Proceed anyway (with justification)
 
 6. **Ask for approval** before creating issues
-7. **Create issues** in order
-8. **Update dependencies** with actual issue numbers after creation
-9. **Present summary** with links to created issues
+7. **Create issues** in dependency order (blockers first)
+8. **Link dependencies** using `tea issues deps add <issue> <blocker>` for each dependency
+9. **Present summary** with links to created issues and dependency graph