```python
# ========================================================================
# PROJECT: User Onboarding Flow
# VERSION: 1.0.0
# DESCRIPTION: Handles user registration, account creation,
#              parallel profile setup, and dashboard entry.
# ========================================================================
# --- GLOBAL STATE DEFINITIONS ---
$user_id = null
$onboarding_status = "not_started"
$account_created = false
# --- MODULE: PROFILE SETUP (The Parallel Block) ---
# This module handles three tasks that can happen in any order.
Module ProfileSetup {
    docs: "docs/profile_setup.md",
    # Start by splitting the flow into three parallel paths
    Profile.Start F-> [Profile.Username, Profile.Photo, Profile.Interests]
    # Individual Node Logic
    Profile.Username /input /save {name} -> Profile.Join
    Profile.Photo    /upload /save {img}  -> Profile.Join
    Profile.Interests /select /save {tags}  -> Profile.Join
    # Synchronize: Wait for ALL three to finish before completing the module
    [Profile.Username, Profile.Photo, Profile.Interests] J-> Profile.Complete
    return {profile_complete: true}
}
# --- MAIN APPLICATION FLOW ---
# 1. Welcome & Email Entry
Welcome.Screen /start /show [doc: "docs/welcome.md"] {email} -> Auth.ValidateEmail
# 2. Email Validation (Branching Logic)
Auth.ValidateEmail /check /verify {email} ? [
    exists -> Welcome.Error {msg: "Email already taken"} -> Welcome.Screen,
    available -> Auth.CreateAccount
]
# 3. Account Creation (External API & Async Wait)
Auth.CreateAccount /execute /call [doc: "docs/account_creation.md"]
    EXT:AuthService.CreateAccount /post /register {$api_key} {email}
    -> WAIT (Account_Created)
    T [5m] -> Auth.Timeout_Handler # If API takes > 5 mins, fail
    -> $user_id = {uid}
    -> $account_created = true
    -> Call ProfileSetup
# 4. Transition to Dashboard
ProfileSetup.Complete -> Dashboard.Welcome /render /show {$user_id}
    -> $onboarding_status = "completed"
    -> Dashboard.Home
# 5. Error Handling (The Dead Letter / Recovery)
Auth.Timeout {
    # If the user abandons the process
    # Redirect to a "Resume Account" page
    Page.Recovery /redirect
}
# --- END OF GRAPH ---
```