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/hooks/ultrawork-mode/detector.ts

@@ -0,0 +1,33 @@
+import {
+  ULTRAWORK_PATTERNS,
+  CODE_BLOCK_PATTERN,
+  INLINE_CODE_PATTERN,
+} from "./constants"
+
+/**
+ * Remove code blocks and inline code from text.
+ * Prevents false positives when keywords appear in code.
+ */
+export function removeCodeBlocks(text: string): string {
+  return text.replace(CODE_BLOCK_PATTERN, "").replace(INLINE_CODE_PATTERN, "")
+}
+
+/**
+ * Detect ultrawork keywords in text (excluding code blocks).
+ */
+export function detectUltraworkKeyword(text: string): boolean {
+  const textWithoutCode = removeCodeBlocks(text)
+  return ULTRAWORK_PATTERNS.some((pattern) => pattern.test(textWithoutCode))
+}
+
+/**
+ * Extract text content from message parts.
+ */
+export function extractPromptText(
+  parts: Array<{ type: string; text?: string }>
+): string {
+  return parts
+    .filter((p) => p.type === "text")
+    .map((p) => p.text || "")
+    .join("")
+}