Enhance configuration checks and persona file creation in doctor and install scripts

- Updated the doctor script to load environment variables from user-specific and project-specific `.env` files, improving configuration management.
- Added checks for the existence of the `SOUL.md` persona file, providing feedback on its status and creating it with a template if missing.
- Enhanced install scripts to create the `SOUL.md` file if it doesn't exist, ensuring users can easily customize the agent's personality.

scripts/install.ps1

@@ -475,6 +475,29 @@ function Copy-ConfigTemplates {
         Write-Info "~/.hermes/config.yaml already exists, keeping it"
     }
     
+    # Create SOUL.md if it doesn't exist (global persona file)
+    $soulPath = "$HermesHome\SOUL.md"
+    if (-not (Test-Path $soulPath)) {
+        @"
+# Hermes Agent Persona
+
+<!-- 
+This file defines the agent's personality and tone.
+The agent will embody whatever you write here.
+Edit this to customize how Hermes communicates with you.
+
+Examples:
+  - "You are a warm, playful assistant who uses kaomoji occasionally."
+  - "You are a concise technical expert. No fluff, just facts."
+  - "You speak like a friendly coworker who happens to know everything."
+
+This file is loaded fresh each message -- no restart needed.
+Delete the contents (or this file) to use the default personality.
+-->
+"@ | Set-Content -Path $soulPath -Encoding UTF8
+        Write-Success "Created ~/.hermes/SOUL.md (edit to customize personality)"
+    }
+    
     Write-Success "Configuration directory ready: ~/.hermes/"
 }