feat: consume worktree field from status line hook events

Parse structured WorktreeInfo (name, path, branch, original_repo_directory)
from WorktreeCreate/Remove hook events and emit a dedicated claude:worktree
event. Store per-conversation worktree state and display an emerald branch
badge in the status bar so users can see at a glance which worktree and
branch each session is running on.

Closes #206

src/lib/components/StatusBar.svelte

@@ -29,6 +29,7 @@
 
   let connectionStatus: ConnectionStatus = $state("disconnected");
   let workingDirectory = $state("");
+  let worktreeInfo: import("$lib/types/worktree").WorktreeInfo | null = $state(null);
   let selectedDirectory = $state("/home/naomi");
   let isConnecting = $state(false);
   let grantedToolsList: string[] = $state([]);
@@ -115,6 +116,10 @@
     workingDirectory = dir;
   });
 
+  claudeStore.worktreeInfo.subscribe((info) => {
+    worktreeInfo = info;
+  });
+
   claudeStore.grantedTools.subscribe((tools) => {
     grantedToolsList = Array.from(tools);
   });
@@ -392,6 +397,18 @@
           {workingDirectory}
         </div>
       {/if}
+      {#if worktreeInfo}
+        <div
+          class="flex items-center gap-1 px-2 py-0.5 rounded-full bg-emerald-500/15 border border-emerald-500/30 text-emerald-400 text-xs"
+          title="Worktree: {worktreeInfo.name} | Base: {worktreeInfo.original_repo_directory}"
+        >
+          <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+              d="M13 10V3L4 14h7v7l9-11h-7z" />
+          </svg>
+          {worktreeInfo.branch}
+        </div>
+      {/if}
     {:else}
       <div class="flex items-center gap-2">
         <span class="text-sm text-gray-600">cwd:</span>

src/lib/stores/claude.ts

@@ -26,6 +26,7 @@ export const claudeStore = {
   grantedTools: conversationsStore.grantedTools,
   pendingRetryMessage: conversationsStore.pendingRetryMessage,
   attachments: conversationsStore.attachments,
+  worktreeInfo: conversationsStore.worktreeInfo,
 
   // New conversation-aware subscriptions
   conversations: conversationsStore.conversations,
@@ -70,6 +71,9 @@ export const claudeStore = {
   // Draft text (per-tab input persistence)
   setDraftText: conversationsStore.setDraftText,
 
+  // Worktree info (per-conversation)
+  setWorktreeInfo: conversationsStore.setWorktreeInfo,
+
   // Conversation management
   createConversation: conversationsStore.createConversation,
   deleteConversation: conversationsStore.deleteConversation,

src/lib/stores/conversations.test.ts

@@ -562,6 +562,54 @@ describe("draft text persistence", () => {
   });
 });
 
+describe("worktreeInfo state management", () => {
+  it("initialises worktreeInfo as null", () => {
+    const conversation = { worktreeInfo: null };
+    expect(conversation.worktreeInfo).toBeNull();
+  });
+
+  it("stores worktreeInfo when a worktree is created", () => {
+    const info = {
+      name: "worktree-abc",
+      path: "/tmp/worktrees/worktree-abc",
+      branch: "feat/my-feature",
+      original_repo_directory: "/home/naomi/code/project",
+    };
+    const conversation = { worktreeInfo: null as typeof info | null };
+    conversation.worktreeInfo = info;
+
+    expect(conversation.worktreeInfo?.branch).toBe("feat/my-feature");
+    expect(conversation.worktreeInfo?.name).toBe("worktree-abc");
+    expect(conversation.worktreeInfo?.original_repo_directory).toBe("/home/naomi/code/project");
+  });
+
+  it("clears worktreeInfo when a worktree is removed", () => {
+    const info = {
+      name: "worktree-abc",
+      path: "/tmp/worktrees/worktree-abc",
+      branch: "feat/my-feature",
+      original_repo_directory: "/home/naomi/code/project",
+    };
+    const conversation = { worktreeInfo: info as typeof info | null };
+    conversation.worktreeInfo = null;
+
+    expect(conversation.worktreeInfo).toBeNull();
+  });
+
+  it("stores worktreeInfo independently per conversation", () => {
+    const conversations = new Map([
+      ["conv-1", { worktreeInfo: null as { branch: string } | null }],
+      ["conv-2", { worktreeInfo: null as { branch: string } | null }],
+    ]);
+
+    const conv1 = conversations.get("conv-1");
+    if (conv1) conv1.worktreeInfo = { branch: "feat/one" };
+
+    expect(conversations.get("conv-1")?.worktreeInfo?.branch).toBe("feat/one");
+    expect(conversations.get("conv-2")?.worktreeInfo).toBeNull();
+  });
+});
+
 describe("isProcessing state management", () => {
   it("starts as false by default", () => {
     const conversation = { id: "conv-1", isProcessing: false };

src/lib/stores/conversations.ts

@@ -7,6 +7,7 @@ import type {
   Attachment,
 } from "$lib/types/messages";
 import type { CharacterState } from "$lib/types/states";
+import type { WorktreeInfo } from "$lib/types/worktree";
 import { cleanupConversationTracking } from "$lib/tauri";
 import { characterState } from "$lib/stores/character";
 import { sessionsStore } from "$lib/stores/sessions";
@@ -41,6 +42,7 @@ export interface Conversation {
   successSoundFired: boolean;
   taskStartSoundFired: boolean;
   draftText: string;
+  worktreeInfo: WorktreeInfo | null;
 }
 
 const TAB_NAMES = [
@@ -165,6 +167,7 @@ function createConversationsStore() {
       successSoundFired: false,
       taskStartSoundFired: false,
       draftText: "",
+      worktreeInfo: null,
     };
   }
 
@@ -220,6 +223,7 @@ function createConversationsStore() {
   const pendingQuestion = derived(activeConversation, ($conv) => $conv?.pendingQuestion || null);
   const scrollPosition = derived(activeConversation, ($conv) => $conv?.scrollPosition ?? -1);
   const attachments = derived(activeConversation, ($conv) => $conv?.attachments || []);
+  const worktreeInfo = derived(activeConversation, ($conv) => $conv?.worktreeInfo ?? null);
 
   return {
     // Expose derived stores for compatibility
@@ -235,6 +239,7 @@ function createConversationsStore() {
     pendingRetryMessage: { subscribe: pendingRetryMessage.subscribe },
     scrollPosition: { subscribe: scrollPosition.subscribe },
     attachments: { subscribe: attachments.subscribe },
+    worktreeInfo: { subscribe: worktreeInfo.subscribe },
 
     // New conversation-specific stores
     conversations: { subscribe: conversations.subscribe },
@@ -976,6 +981,16 @@ function createConversationsStore() {
       });
     },
 
+    setWorktreeInfo: (conversationId: string, info: WorktreeInfo | null) => {
+      conversations.update((convs) => {
+        const conv = convs.get(conversationId);
+        if (conv) {
+          conv.worktreeInfo = info;
+        }
+        return convs;
+      });
+    },
+
     // Add initialization helper
     initialize: () => {
       ensureInitialized();

src/lib/tauri.ts

@@ -13,6 +13,7 @@ import type {
 } from "$lib/types/messages";
 import type { CharacterState } from "$lib/types/states";
 import type { AgentStartPayload, AgentEndPayload } from "$lib/types/agents";
+import type { WorktreeEvent } from "$lib/types/worktree";
 import { agentStore } from "$lib/stores/agents";
 import { todos } from "$lib/stores/todos";
 import {
@@ -563,6 +564,18 @@ export async function initializeTauriListeners() {
   });
   unlisteners.push(agentEndUnlisten);
 
+  const worktreeUnlisten = await listen<WorktreeEvent>("claude:worktree", (event) => {
+    const { conversation_id, event_type, worktree } = event.payload;
+    const targetConversationId = conversation_id || get(claudeStore.activeConversationId);
+    if (targetConversationId) {
+      claudeStore.setWorktreeInfo(
+        targetConversationId,
+        event_type === "create" && worktree ? worktree : null
+      );
+    }
+  });
+  unlisteners.push(worktreeUnlisten);
+
   const questionUnlisten = await listen<UserQuestionEvent>("claude:question", (event) => {
     const questionEvent = event.payload;
 

src/lib/types/worktree.ts

@@ -0,0 +1,13 @@
+export interface WorktreeInfo {
+  name: string;
+  path: string;
+  branch: string;
+  original_repo_directory: string;
+}
+
+export interface WorktreeEvent {
+  conversation_id?: string;
+  /** "create" or "remove" */
+  event_type: string;
+  worktree?: WorktreeInfo;
+}