feat(hooks): add ultrawork-mode hook for automatic agent orchestration guidance

When "ultrawork" or "ulw" keyword is detected in user prompt:
- Injects ULTRAWORK_CONTEXT with agent-agnostic guidance
- Executes AFTER CC hooks (UserPromptSubmit etc.)
- Follows existing hook pattern (think-mode style)

Key features:
- Agent orchestration principles (by capability, not name)
- Parallel execution rules
- TODO tracking enforcement
- Delegation guidance

Closes #31

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src/config/schema.ts

@@ -39,6 +39,7 @@ export const HookNameSchema = z.enum([
   "rules-injector",
   "background-notification",
   "auto-update-checker",
+  "ultrawork-mode",
 ])
 
 export const AgentOverrideConfigSchema = z.object({