feat(KB-330): rename internal packages from @kb/* to @fusion/*

- Rename @kb/core, @kb/dashboard, @kb/engine to @fusion/* namespace
- Update all import statements across 143+ files to use new package names
- Update workspace dependencies and root package.json references
- Fix bundler configurations (tsup, vite) for new package names
- Update test files and fix typecheck issues
- Add changeset file documenting the package rename

packages/engine/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@kb/engine",
+  "name": "@fusion/engine",
   "version": "0.1.0",
   "type": "module",
   "exports": {
@@ -21,7 +21,7 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@kb/core": "workspace:*",
+    "@fusion/core": "workspace:*",
     "@mariozechner/pi-ai": "^0.62.0",
     "@mariozechner/pi-coding-agent": "^0.62.0"
   },

packages/engine/src/agent-heartbeat.ts

@@ -10,7 +10,7 @@
  * - onTerminated: Called when an unresponsive agent is terminated
  */
 
-import type { AgentStore, Agent, AgentState } from "@kb/core";
+import type { AgentStore, Agent, AgentState } from "@fusion/core";
 
 /** Options for HeartbeatMonitor constructor */
 export interface HeartbeatMonitorOptions {

packages/engine/src/agent-logger.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { AgentLogger, summarizeToolArgs } from "./agent-logger.js";
-import type { TaskStore } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
 
 // ── summarizeToolArgs tests ──────────────────────────────────────────
 

packages/engine/src/agent-logger.ts

@@ -1,4 +1,4 @@
-import type { TaskStore, AgentRole } from "@kb/core";
+import type { TaskStore, AgentRole } from "@fusion/core";
 
 /** Default byte threshold before an automatic flush. */
 const FLUSH_SIZE_BYTES = 1024;

packages/engine/src/cron-runner.test.ts

@@ -1,9 +1,9 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { CronRunner } from "./cron-runner.js";
-import type { TaskStore, AutomationStore, ScheduledTask, AutomationRunResult, AutomationStep, Settings } from "@kb/core";
+import type { TaskStore, AutomationStore, ScheduledTask, AutomationRunResult, AutomationStep, Settings } from "@fusion/core";
 import { randomUUID } from "node:crypto";
 
-// Default settings inline to avoid @kb/core build dependency during tests
+// Default settings inline to avoid @fusion/core build dependency during tests
 const DEFAULT_SETTINGS: Settings = {
   maxConcurrent: 2,
   maxWorktrees: 4,
@@ -21,9 +21,9 @@ const DEFAULT_SETTINGS: Settings = {
   planningModelId: "claude-sonnet-4-5",
   validatorProvider: "openai",
   validatorModelId: "gpt-4o",
-  autoUpdatePrStatus: true,
-  autoCreatePr: false,
   taskStuckTimeoutMs: undefined,
+  groupOverlappingFiles: false,
+  autoMerge: true,
 };
 
 function createMockSchedule(overrides: Partial<ScheduledTask> = {}): ScheduledTask {

packages/engine/src/cron-runner.ts

@@ -1,8 +1,8 @@
 import { exec } from "node:child_process";
 import { promisify } from "node:util";
-import type { TaskStore } from "@kb/core";
-import type { AutomationStore } from "@kb/core";
-import type { ScheduledTask, AutomationRunResult, AutomationStep, AutomationStepResult } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
+import type { AutomationStore } from "@fusion/core";
+import type { ScheduledTask, AutomationRunResult, AutomationStep, AutomationStepResult } from "@fusion/core";
 import { createLogger } from "./logger.js";
 
 const execAsync = promisify(exec);

packages/engine/src/executor.test.ts

@@ -38,7 +38,7 @@ import { execSync } from "node:child_process";
 import { findWorktreeUser, aiMergeTask } from "./merger.js";
 import { WorktreePool } from "./worktree-pool.js";
 import { generateWorktreeName, slugify } from "./worktree-names.js";
-import type { Column, Task, TaskDetail } from "@kb/core";
+import type { Column, Task, TaskDetail } from "@fusion/core";
 
 const mockedCreateHaiAgent = vi.mocked(createKbAgent);
 

packages/engine/src/executor.ts

@@ -1,7 +1,7 @@
 import { execSync } from "node:child_process";
 import { join } from "node:path";
 import { existsSync } from "node:fs";
-import type { TaskStore, Task, TaskDetail, StepStatus, Settings, WorkflowStep } from "@kb/core";
+import type { TaskStore, Task, TaskDetail, StepStatus, Settings, WorkflowStep } from "@fusion/core";
 import { findWorktreeUser } from "./merger.js";
 import { generateWorktreeName, slugify } from "./worktree-names.js";
 import { Type, type Static } from "@mariozechner/pi-ai";
@@ -1028,7 +1028,7 @@ export class TaskExecutor {
     if (!currentTask.enabledWorkflowSteps?.length) return true;
 
     const workflowStepIds = currentTask.enabledWorkflowSteps;
-    const results: import("@kb/core").WorkflowStepResult[] = [];
+    const results: import("@fusion/core").WorkflowStepResult[] = [];
 
     for (const wsId of workflowStepIds) {
       const ws = await this.store.getWorkflowStep(wsId);

packages/engine/src/logger.ts

@@ -1,5 +1,5 @@
 /**
- * Lightweight structured logger for the `@kb/engine` package.
+ * Lightweight structured logger for the `@fusion/engine` package.
  *
  * Usage:
  * ```ts

packages/engine/src/merger.test.ts

@@ -32,7 +32,7 @@ import {
 } from "./merger.js";
 import { createKbAgent } from "./pi.js";
 import { execSync } from "node:child_process";
-import { type TaskStore, type Task, type MergeResult, DEFAULT_SETTINGS } from "@kb/core";
+import { type TaskStore, type Task, type MergeResult, DEFAULT_SETTINGS } from "@fusion/core";
 
 const mockedCreateHaiAgent = vi.mocked(createKbAgent);
 const mockedExecSync = vi.mocked(execSync);

packages/engine/src/merger.ts

@@ -1,6 +1,6 @@
 import { execSync } from "node:child_process";
 import { existsSync, readFileSync } from "node:fs";
-import type { TaskStore, Task, MergeResult } from "@kb/core";
+import type { TaskStore, Task, MergeResult } from "@fusion/core";
 import { createKbAgent } from "./pi.js";
 import type { WorktreePool } from "./worktree-pool.js";
 import { AgentLogger } from "./agent-logger.js";

packages/engine/src/notifier.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { EventEmitter } from "node:events";
-import type { Task, Column, MergeResult, Settings } from "@kb/core";
+import type { Task, Column, MergeResult, Settings } from "@fusion/core";
 import { NtfyNotifier } from "./notifier.js";
 
 // Mock the logger

packages/engine/src/notifier.ts

@@ -1,4 +1,4 @@
-import type { TaskStore, Task, Column, Settings, MergeResult } from "@kb/core";
+import type { TaskStore, Task, Column, Settings, MergeResult } from "@fusion/core";
 import { EventEmitter } from "node:events";
 import { schedulerLog } from "./logger.js";
 

packages/engine/src/pr-comment-handler.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { PrCommentHandler } from "./pr-comment-handler.js";
-import type { TaskStore, Task } from "@kb/core";
+import type { TaskStore, Task } from "@fusion/core";
 
 const mockStore = {
   addSteeringComment: vi.fn<(id: string, text: string, author?: "user" | "agent") => Promise<Task>>(),

packages/engine/src/pr-comment-handler.ts

@@ -1,5 +1,5 @@
-import type { TaskStore } from "@kb/core";
-import type { PrInfo } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
+import type { PrInfo } from "@fusion/core";
 import { prMonitorLog } from "./logger.js";
 
 interface PrComment {

packages/engine/src/pr-monitor.ts

@@ -1,5 +1,5 @@
 import { prMonitorLog } from "./logger.js";
-import type { PrInfo } from "@kb/core";
+import type { PrInfo } from "@fusion/core";
 
 export interface TrackedPr {
   owner: string;
@@ -44,7 +44,7 @@ interface GhPrViewJson {
  */
 async function checkGhAuth(): Promise<boolean> {
   try {
-    const { isGhAvailable, isGhAuthenticated } = await import("@kb/core");
+    const { isGhAvailable, isGhAuthenticated } = await import("@fusion/core");
     return isGhAvailable() && isGhAuthenticated();
   } catch {
     return false;
@@ -60,7 +60,7 @@ async function fetchCommentsWithGh(
   prNumber: number,
   since?: string
 ): Promise<PrComment[]> {
-  const { runGhJson } = await import("@kb/core");
+  const { runGhJson } = await import("@fusion/core");
   
   const pr = await runGhJson<GhPrViewJson>([
     "pr", "view", String(prNumber),

packages/engine/src/restart.integration.test.ts

@@ -36,7 +36,7 @@ import { WorktreePool, scanIdleWorktrees, cleanupOrphanedWorktrees } from "./wor
 import { createKbAgent } from "./pi.js";
 import { execSync } from "node:child_process";
 import { existsSync, readdirSync } from "node:fs";
-import type { Task, TaskDetail, TaskStep, Column, Settings, StepStatus } from "@kb/core";
+import type { Task, TaskDetail, TaskStep, Column, Settings, StepStatus } from "@fusion/core";
 
 const mockedCreateHaiAgent = vi.mocked(createKbAgent);
 const mockedExecSync = vi.mocked(execSync);
@@ -267,7 +267,7 @@ describe("In-progress task resume after restart", () => {
 // ── Step 3: In-review merge re-queue tests ────────────────────────────────
 //
 // The merge queue/enqueueMerge logic lives in dashboard.ts (CLI layer).
-// These tests focus on what @kb/engine owns: aiMergeTask() behaviour
+// These tests focus on what @fusion/engine owns: aiMergeTask() behaviour
 // relevant to restart resilience — state validation, status lifecycle,
 // and error handling with git reset --merge cleanup.
 

packages/engine/src/reviewer.ts

@@ -8,7 +8,7 @@
  * - Verdict + feedback is returned to the worker
  */
 
-import type { TaskStore } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
 import { createKbAgent } from "./pi.js";
 import { AgentLogger } from "./agent-logger.js";
 import { checkSessionError } from "./usage-limit-detector.js";

packages/engine/src/scheduler.test.ts

@@ -1,6 +1,7 @@
 import { describe, it, expect, vi } from "vitest";
 import { Scheduler, pathsOverlap } from "./scheduler.js";
-import type { TaskStore, Task } from "@kb/core";
+import { AgentSemaphore } from "./concurrency.js";
+import type { TaskStore, Task } from "@fusion/core";
 
 // Helper to create mock tasks
 function createMockTask(overrides: Partial<Task> = {}): Task {
@@ -181,7 +182,7 @@ describe("Scheduler", () => {
         totalCount: 2,
         acquire: vi.fn().mockResolvedValue(undefined),
         release: vi.fn(),
-      };
+      } as unknown as AgentSemaphore;
       
       const tasks = [
         createMockTask({ id: "KB-001", column: "in-progress" }),

packages/engine/src/scheduler.ts

@@ -1,4 +1,4 @@
-import { resolveDependencyOrder, type TaskStore, type Task } from "@kb/core";
+import { resolveDependencyOrder, type TaskStore, type Task } from "@fusion/core";
 import type { AgentSemaphore } from "./concurrency.js";
 import { schedulerLog } from "./logger.js";
 import type { PrMonitor } from "./pr-monitor.js";

packages/engine/src/stuck-task-detector.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { StuckTaskDetector } from "./stuck-task-detector.js";
-import type { TaskStore } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
 
 // Mock store factory
 function createMockStore(overrides: Partial<TaskStore> = {}): TaskStore {

packages/engine/src/stuck-task-detector.ts

@@ -11,7 +11,7 @@
  * compares the last activity timestamp against `taskStuckTimeoutMs` from settings.
  */
 
-import type { TaskStore, Settings } from "@kb/core";
+import type { TaskStore, Settings } from "@fusion/core";
 import { createLogger } from "./logger.js";
 
 const stuckLog = createLogger("stuck-detector");

packages/engine/src/triage.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
-import type { TaskStore, Task, TaskDetail, Settings } from "@kb/core";
+import type { TaskStore, Task, TaskDetail, Settings } from "@fusion/core";
 import {
   TriageProcessor,
   TRIAGE_SYSTEM_PROMPT,

packages/engine/src/triage.ts

@@ -4,7 +4,7 @@ import type {
   TaskDetail,
   TaskAttachment,
   Settings,
-} from "@kb/core";
+} from "@fusion/core";
 import type { ImageContent } from "@mariozechner/pi-ai";
 import { Type, type Static } from "@mariozechner/pi-ai";
 import type {

packages/engine/src/usage-limit-detector.ts

@@ -9,7 +9,7 @@
  * on their own via per-session retry.
  */
 
-import type { TaskStore } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
 import { createLogger } from "./logger.js";
 
 const log = createLogger("usage-limit");

packages/engine/src/worktree-pool.test.ts

@@ -12,7 +12,7 @@ vi.mock("node:fs", () => ({
 import { WorktreePool, scanIdleWorktrees, cleanupOrphanedWorktrees } from "./worktree-pool.js";
 import { execSync } from "node:child_process";
 import { existsSync, readdirSync } from "node:fs";
-import type { Task, Column } from "@kb/core";
+import type { Task, Column } from "@fusion/core";
 
 const mockedExecSync = vi.mocked(execSync);
 const mockedExistsSync = vi.mocked(existsSync);

packages/engine/src/worktree-pool.ts

@@ -1,7 +1,7 @@
 import { execSync } from "node:child_process";
 import { existsSync, readdirSync } from "node:fs";
 import { join } from "node:path";
-import type { TaskStore } from "@kb/core";
+import type { TaskStore } from "@fusion/core";
 import { worktreePoolLog } from "./logger.js";
 
 /**