test(app): share workspace slug wait helper across e2e specs (#16446)

packages/app/e2e/AGENTS.md

@@ -72,6 +72,9 @@ test("test description", async ({ page, sdk, gotoSession }) => {
 - `openSidebar(page)` / `closeSidebar(page)` - Toggle sidebar
 - `withSession(sdk, title, callback)` - Create temp session
 - `withProject(...)` - Create temp project/workspace
+- `sessionIDFromUrl(url)` - Read session ID from URL
+- `slugFromUrl(url)` - Read workspace slug from URL
+- `waitSlug(page, skip?)` - Wait for resolved workspace slug
 - `trackSession(sessionID, directory?)` - Register session for fixture cleanup
 - `trackDirectory(directory)` - Register directory for fixture cleanup
 - `clickListItem(container, filter)` - Click list item by key/text
@@ -169,9 +172,10 @@ await page.keyboard.press(`${modKey}+Comma`) // Open settings
 1. Choose appropriate folder or create new one
 2. Import from `../fixtures`
 3. Use helper functions from `../actions` and `../selectors`
-4. Clean up any created resources
-5. Use specific selectors (avoid CSS classes)
-6. Test one feature per test file
+4. When validating routing, use shared helpers from `../actions`. Workspace URL slugs can be canonicalized on Windows, so assert against canonical or resolved workspace slugs.
+5. Clean up any created resources
+6. Use specific selectors (avoid CSS classes)
+7. Test one feature per test file
 
 ## Local Development