feat(builtin-commands): add /refactor command for intelligent LSP/AST-based refactoring

Ports the refactor command from ~/.config/opencode/command/refactor.md to the project as a builtin command.

The /refactor command provides deterministic, LSP/AST-aware refactoring with:
- Automatic intent analysis and codebase mapping
- Risk assessment with test coverage verification
- Detailed planning via Plan agent
- Step-by-step execution with continuous verification
- Zero-regression guarantees via comprehensive testing

Supports multiple refactoring scopes (file/module/project) and strategies (safe/aggressive).

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/features/builtin-commands/commands.ts

@@ -2,6 +2,7 @@ import type { CommandDefinition } from "../claude-code-command-loader"
 import type { BuiltinCommandName, BuiltinCommands } from "./types"
 import { INIT_DEEP_TEMPLATE } from "./templates/init-deep"
 import { RALPH_LOOP_TEMPLATE, CANCEL_RALPH_TEMPLATE } from "./templates/ralph-loop"
+import { REFACTOR_TEMPLATE } from "./templates/refactor"
 
 const BUILTIN_COMMAND_DEFINITIONS: Record<BuiltinCommandName, Omit<CommandDefinition, "name">> = {
   "init-deep": {
@@ -32,6 +33,14 @@ $ARGUMENTS
 ${CANCEL_RALPH_TEMPLATE}
 </command-instruction>`,
   },
+  refactor: {
+    description:
+      "(builtin) Intelligent refactoring command with LSP, AST-grep, architecture analysis, codemap, and TDD verification.",
+    template: `<command-instruction>
+${REFACTOR_TEMPLATE}
+</command-instruction>`,
+    argumentHint: "<refactoring-target> [--scope=<file|module|project>] [--strategy=<safe|aggressive>]",
+  },
 }
 
 export function loadBuiltinCommands(