refactor(hooks): rename ultrawork-mode to keyword-detector with multi-keyword support

- Detect ultrawork, search, analyze keywords (EN/KO/JP/CN/VN)
- Add session-based injection tracking (once per session)
- Remove unnecessary state management

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

src/hooks/keyword-detector/index.ts

@@ -0,0 +1,72 @@
+import { detectKeywords, extractPromptText } from "./detector"
+import { log } from "../../shared"
+import { injectHookMessage } from "../../features/hook-message-injector"
+
+export * from "./detector"
+export * from "./constants"
+export * from "./types"
+
+const injectedSessions = new Set<string>()
+
+export function createKeywordDetectorHook() {
+  return {
+    "chat.message": async (
+      input: {
+        sessionID: string
+        agent?: string
+        model?: { providerID: string; modelID: string }
+        messageID?: string
+      },
+      output: {
+        message: Record<string, unknown>
+        parts: Array<{ type: string; text?: string; [key: string]: unknown }>
+      }
+    ): Promise<void> => {
+      if (injectedSessions.has(input.sessionID)) {
+        return
+      }
+
+      const promptText = extractPromptText(output.parts)
+      const messages = detectKeywords(promptText)
+
+      if (messages.length === 0) {
+        return
+      }
+
+      log(`Keywords detected: ${messages.length}`, { sessionID: input.sessionID })
+
+      const message = output.message as {
+        agent?: string
+        model?: { modelID?: string; providerID?: string }
+        path?: { cwd?: string; root?: string }
+        tools?: Record<string, boolean>
+      }
+
+      const context = messages.join("\n")
+      const success = injectHookMessage(input.sessionID, context, {
+        agent: message.agent,
+        model: message.model,
+        path: message.path,
+        tools: message.tools,
+      })
+
+      if (success) {
+        injectedSessions.add(input.sessionID)
+        log("Keyword context injected", { sessionID: input.sessionID })
+      }
+    },
+
+    event: async ({
+      event,
+    }: {
+      event: { type: string; properties?: unknown }
+    }) => {
+      if (event.type === "session.deleted") {
+        const props = event.properties as { info?: { id?: string } } | undefined
+        if (props?.info?.id) {
+          injectedSessions.delete(props.info.id)
+        }
+      }
+    },
+  }
+}