Add /diff and /template commands

- /diff command to compare config with backups
  - Shows added/removed/changed files
  - JSON-aware comparison for config files
  - List available backups
- /template command for session templates
  - Built-in templates: daily-standup, code-review, troubleshoot, deploy
  - Each template includes checklist, initial commands, prompt
  - Create custom templates interactively or non-interactively
- Updated shell completions with 21 aliases total
- Test suite now covers 29 tests

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

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

automation/completions.zsh

@@ -131,6 +131,24 @@ _claude_agent_info() {
         '*:name:'
 }
 
+# Config diff completion
+_claude_diff() {
+    _arguments \
+        '--backup[Backup file]:file:_files' \
+        '--list[List backups]' \
+        '--json[JSON output]'
+}
+
+# Template completion
+_claude_template() {
+    _arguments \
+        '--list[List templates]' \
+        '--create[Create template]:name:' \
+        '--use[Use template]:name:' \
+        '--delete[Delete template]:name:' \
+        '--non-interactive[Non-interactive mode]'
+}
+
 # Register completions
 compdef _memory_add memory-add.py
 compdef _memory_list memory-list.py
@@ -145,6 +163,8 @@ compdef _claude_upgrade upgrade.sh
 compdef _claude_workflow workflow-info.py
 compdef _claude_skill_info skill-info.py
 compdef _claude_agent_info agent-info.py
+compdef _claude_diff config-diff.py
+compdef _claude_template session-template.py
 
 # Aliases
 alias claude-validate='~/.claude/automation/validate-setup.sh'
@@ -167,8 +187,10 @@ alias claude-upgrade='~/.claude/automation/upgrade.sh'
 alias claude-workflow='python3 ~/.claude/automation/workflow-info.py'
 alias claude-skill='python3 ~/.claude/automation/skill-info.py'
 alias claude-agent='python3 ~/.claude/automation/agent-info.py'
+alias claude-diff='python3 ~/.claude/automation/config-diff.py'
+alias claude-template='python3 ~/.claude/automation/session-template.py'
 
 echo "Claude Code completions loaded (zsh)"
 echo "  Aliases: claude-{validate,status,backup,restore,clean,memory-add,memory-list,search}"
 echo "           claude-{history,install,test,maintenance,log,debug,export,mcp,upgrade}"
-echo "           claude-{workflow,skill,agent}"
+echo "           claude-{workflow,skill,agent,diff,template}"