docs: fold the Windows quick-start back into one powershell block

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -36,33 +36,21 @@ manually from the app (**Start AI** in the sidebar), not at boot.
 
 ### Windows (recommended)
 
-**0. Allow scripts to run.** PowerShell blocks unsigned scripts by default,
-which stops Nexus's CLI from working. **Process** scope covers only the current
-terminal window:
-
 ```powershell
+# 0. Allow scripts to run (PowerShell blocks unsigned scripts by default, which
+#    stops Nexus's CLI from working). Process scope covers only this window;
+#    LocalMachine makes it permanent so ncp works from every future shell (run
+#    PowerShell as Administrator for the LocalMachine line).
 Set-ExecutionPolicy -Scope Process       -ExecutionPolicy Bypass -Force
-```
-
-**LocalMachine** scope makes it permanent, so `ncp` works from every future
-shell (run PowerShell as Administrator for this one):
-
-```powershell
 Set-ExecutionPolicy -Scope LocalMachine  -ExecutionPolicy RemoteSigned -Force
-```
 
-**1. Install Git and clone** (public repo, no account/token needed):
-
-```powershell
+# 1. Install Git, then clone (public repo, no account/token needed):
 winget install Git.Git
 # open a NEW PowerShell window, then:
 git clone https://git.enderofwings.com/enderofwings/NexusOS.git nexus-core
 cd nexus-core
-```
 
-**2. Native install** — winget Python/Node/Ollama, venv, pip, web build, desktop icon:
-
-```powershell
+# 2. Native install — winget Python/Node/Ollama, venv, pip, web build, desktop icon
 powershell -ExecutionPolicy Bypass -File .\install-windows.ps1
 ```