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>

state/component-registry.json

@@ -199,6 +199,16 @@
       "description": "Show agent information",
       "aliases": ["/agent", "/agents"],
       "invokes": "command:agent-info"
+    },
+    "/diff": {
+      "description": "Compare config with backup",
+      "aliases": ["/config-diff", "/compare"],
+      "invokes": "command:diff"
+    },
+    "/template": {
+      "description": "Manage session templates",
+      "aliases": ["/templates", "/session-template"],
+      "invokes": "command:template"
     }
   },
   "agents": {
@@ -336,7 +346,9 @@
       "upgrade": "~/.claude/automation/upgrade.sh",
       "workflow-info": "~/.claude/automation/workflow-info.py",
       "skill-info": "~/.claude/automation/skill-info.py",
-      "agent-info": "~/.claude/automation/agent-info.py"
+      "agent-info": "~/.claude/automation/agent-info.py",
+      "config-diff": "~/.claude/automation/config-diff.py",
+      "session-template": "~/.claude/automation/session-template.py"
     },
     "completions": {
       "bash": "~/.claude/automation/completions.bash",