Prefer AGENTS.md over CLAUDE.md for project instructions (#439)

* Prefer AGENTS.md over CLAUDE.md for project instructions

* fix: preserve CLAUDE.md fallback behavior

* fix: isolate onboarding tests and preserve legacy init

* fix: restore full fsOperations exports in test mock and align compact cwd

* Fix onboarding test isolation and init migration guidance

* Tighten init prompt coverage and onboarding copy

* Handle nested project instruction paths consistently

* Fix NEW_INIT feature gate for Bun build

---------

Co-authored-by: 赵小落 <zhaoxiaoluo@zhaoxiaoluodeMac-mini.local>
Co-authored-by: zhaomo01 <zhaomo01@baidu.com>

src/projectOnboardingSteps.ts

@@ -0,0 +1,44 @@
+import { getCwd } from './utils/cwd.js'
+import { isDirEmpty } from './utils/file.js'
+import { getFsImplementation } from './utils/fsOperations.js'
+import { findProjectInstructionFilePathInAncestors } from './utils/projectInstructions.js'
+
+export type Step = {
+  key: string
+  text: string
+  isComplete: boolean
+  isCompletable: boolean
+  isEnabled: boolean
+}
+
+export function getSteps(): Step[] {
+  const hasRepoInstructions =
+    findProjectInstructionFilePathInAncestors(
+      getCwd(),
+      getFsImplementation().existsSync,
+    ) !== null
+  const isWorkspaceDirEmpty = isDirEmpty(getCwd())
+
+  return [
+    {
+      key: 'workspace',
+      text: 'Ask Claude to create a new app or clone a repository',
+      isComplete: false,
+      isCompletable: true,
+      isEnabled: isWorkspaceDirEmpty,
+    },
+    {
+      key: 'claudemd',
+      text: 'Set up repo instructions (/init creates AGENTS.md or updates existing CLAUDE.md; either file counts)',
+      isComplete: hasRepoInstructions,
+      isCompletable: true,
+      isEnabled: !isWorkspaceDirEmpty,
+    },
+  ]
+}
+
+export function isProjectOnboardingComplete(): boolean {
+  return getSteps()
+    .filter(({ isCompletable, isEnabled }) => isCompletable && isEnabled)
+    .every(({ isComplete }) => isComplete)
+}