Update all command files to use optimized template system

- Migrated 18 command files to use @include references
- Replaced custom legend sections with shared constants
- Standardized flag descriptions and report outputs
- Eliminated redundant content across commands
- Improved consistency and maintainability

Part of the 35% token reduction optimization.

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

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

.claude/commands/git.md

@@ -40,7 +40,7 @@ Git operations:
 
 @see shared/git-workflow.yml ∀ best practices
 @see shared/checkpoint.yml ∀ checkpoint system
-@see shared/error-recovery-enhanced.yml ∀ safety checks
+@see shared/error-handling.yml ∀ safety checks
 
 Workflow: Check status→Create chkpt→Execute→Verify→Sync